Sample records for annual inflation interest

  1. Saving & Storing Annual Evaluations & Conflict of Interest/Compensated Outside Activity Forms

    E-Print Network [OSTI]

    Hemmers, Oliver

    Saving & Storing Annual Evaluations & Conflict of Interest/Compensated Outside Activity Forms....................................................................................................................................................7 NOTE: Accessing the folders to save Annual Evaluations and Conflict of Interest

  2. Monetary Policy, Nominal Interest Rates, and Long-horizon Inflation Uncertainty

    E-Print Network [OSTI]

    Wright, Stephen M

    2004-06-16T23:59:59.000Z

    of the countries examined in this paper (the United2 Kingdom and Canada) and only in the latter part of the historical period I examine. seem clear that the nature of the market imperfections will affect the nature of the objective. Price, and possibly inflation... at similar times in the early and late 1970s, and downward shocks in the mid-1980s. This is of course unsurprising given what we know about the history of oil and other commodity prices. (iii) Whilst the impulses were similar in all countries, the responses...

  3. Multi-Stream Inflation: Bifurcations and Recombinations in the Multiverse

    E-Print Network [OSTI]

    Yi Wang

    2010-01-06T23:59:59.000Z

    In this Letter, we briefly review the multi-stream inflation scenario, and discuss its implications in the string theory landscape and the inflationary multiverse. In multi-stream inflation, the inflation trajectory encounters bifurcations. If these bifurcations are in the observable stage of inflation, then interesting observational effects can take place, such as domain fences, non-Gaussianities, features and asymmetries in the CMB. On the other hand, if the bifurcation takes place in the eternal stage of inflation, it provides an alternative creation mechanism of bubbles universes in eternal inflation, as well as a mechanism to locally terminate eternal inflation, which reduces the measure of eternal inflation.

  4. Running Inflation

    E-Print Network [OSTI]

    Jae-weon Lee; In-guy Koh

    1997-04-30T23:59:59.000Z

    A first order inflation model where a gauge coupling constant runs as the universe inflates is investigated. This model can solve the graceful-exit problem within Einstein gravity by varying the bubble formation rate. The sufficient expansion condition gives group theoretical constraints on the inflaton field, while the appropriate density perturbation requires an additional scalar field or cosmic strings.

  5. Polymer inflation

    E-Print Network [OSTI]

    Syed Moeez Hassan; Viqar Husain; Sanjeev S. Seahra

    2015-03-05T23:59:59.000Z

    We consider the semi-classical dynamics of a free massive scalar field in a homogeneous and isotropic cosmological spacetime. The scalar field is quantized using the polymer quantization method assuming that it is described by a gaussian coherent state. For quadratic potentials, the semi-classical equations of motion yield a universe that has an early "polymer inflation" phase which is generic and almost exactly de Sitter, followed by a epoch of slow-roll inflation. We compute polymer corrections to the slow roll formalism, and discuss the probability of inflation in this model using a physical Hamiltonian arising from time gauge fixing. We also show how in this model, it is possible to obtain a significant amount of slow-roll inflation from sub-Planckain initial data, hence circumventing some of the criticisms of standard scenarios. These results show the extent to which a quantum gravity motivated quantization method affects early universe dynamics.

  6. Goldstone Inflation

    E-Print Network [OSTI]

    Croon, Djuna; Setford, Jack

    2015-01-01T23:59:59.000Z

    Identifying the inflaton with a pseudo-Goldstone boson explains the flatness of its potential. Additionally, successful Goldstone Inflation should be robust against UV corrections, such as from quantum gravity. In this paper we present the scenarios which lead to this successful model by examining the structure of Goldstone potentials arising from Coleman-Weinberg contributions. In particular, we notice that both bosonic and fermionic contributions are required to build a successful inflationary model. In single field inflation, we find that spinorial, and not fundamental, fermion representations can generate the right potential shape. This indicates that the Goldstone inflaton comes from the breaking of a $SO(N)$ global symmetry. We also evaluate the constraints from higher-derivative interactions, finding that axiomatic constraints on Goldstone boson scattering prevail over the current CMB constraints on the speed of sound. We connect inflationary constraints to the UV completions for Goldstone Inflation, f...

  7. Khronon inflation

    SciTech Connect (OSTI)

    Creminelli, Paolo [Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151, Trieste (Italy); Noreña, Jorge [ICC, University of Barcelona (IEEC-UB), Marti i Franques 1, Barcelona 08028 (Spain); Peña, Manuel [Depto. de Física Teórica and IFIC, Universdad de Valencia-CSIC, Edificio de Institutos de Paterna, E-46980, Paterna (Valencia) (Spain); Simonovi?, Marko, E-mail: creminel@ictp.it, E-mail: jorge.norena@icc.ub.edu, E-mail: mapeji@ific.uv.es, E-mail: marko.simonovic@sissa.it [SISSA, via Bonomea 265, 34136, Trieste (Italy)

    2012-11-01T23:59:59.000Z

    We study the possibility that the approximate time shift symmetry during inflation is promoted to the full invariance under time reparametrization t ? t-tilde (t), or equivalently under field redefinition of the inflaton ? ? ?-tilde (?). The symmetry allows only two operators at leading order in derivatives, so that all n-point functions of scalar perturbations are fixed in terms of the power spectrum normalization and the speed of sound. During inflation the decaying mode only decays as 1/a and this opens up the possibility to violate some of the consistency relations in the squeezed limit, although this violation is suppressed by the (small) breaking of the field reparametrization symmetry. In particular one can get terms in the 3-point function that are only suppressed by 1/k{sub L} in the squeezed limit k{sub L}?0 compared to the local shape.

  8. Open inflation in the landscape

    E-Print Network [OSTI]

    Daisuke Yamauchi; Andrei Linde; Atsushi Naruko; Misao Sasaki; Takahiro Tanaka

    2011-08-11T23:59:59.000Z

    Open inflation scenario is attracting a renewed interest in the context of string landscape. Since there are a large number of metastable de Sitter vacua in string landscape, tunneling transitions to lower metastable vacua through the bubble nucleation occur quite naturally. Although the deviation of Omega_0 from unity is small by the observational bound, we argue that the effect of this small deviation on the large angle CMB anisotropies can be significant for tensor-type perturbation in open inflation scenario. We consider the situation in which there is a large hierarchy between the energy scale of the quantum tunneling and that of the slow-roll inflation in the nucleated bubble. If the potential just after tunneling is steep enough, a rapid-roll phase appears before the slow-roll inflation. In this case the power spectrum is basically determined by the Hubble rate during the slow-roll inflation. If such rapid-roll phase is absent, the power spectrum keeps the memory of the high energy density there in the large angular components. The amplitude of large angular components can be enhanced due to the effects of the wall fluctuation mode if the bubble wall tension is small. Therefore, one can construct some models in which the deviation of Omega_0 from unity is large enough to produce measurable effects. We also consider a more general class of models, where the false vacuum decay may occur due to Hawking-Moss tunneling, as well as the models involving more than one scalar field. We discuss scalar perturbations in these models and point out that a large set of such models is already ruled out by observational data, unless there was a very long stage of slow-roll inflation after the tunneling. These results show that observational data allow us to test various assumptions concerning the structure of the string theory potentials and the duration of the last stage of inflation.

  9. Open inflation in the landscape

    E-Print Network [OSTI]

    Yamauchi, Daisuke; Naruko, Atsushi; Sasaki, Misao; Tanaka, Takahiro

    2011-01-01T23:59:59.000Z

    Open inflation scenario is attracting a renewed interest in the context of string landscape. Since there are a large number of metastable de Sitter vacua in string landscape, tunneling transitions to lower metastable vacua through the bubble nucleation occur quite naturally. Although the deviation of Omega_0 from unity is small by the observational bound, we argue that the effect of this small deviation on the large angle CMB anisotropies can be significant for tensor-type perturbation in open inflation scenario. We consider the situation in which there is a large hierarchy between the energy scale of the quantum tunneling and that of the slow-roll inflation in the nucleated bubble. If the potential just after tunneling is steep enough, a rapid-roll phase appears before the slow-roll inflation. In this case the power spectrum is basically determined by the Hubble rate during the slow-roll inflation. If such rapid-roll phase is absent, the power spectrum keeps the memory of the high energy density there in the...

  10. The expected anisotropy in solid inflation

    E-Print Network [OSTI]

    Nicola Bartolo; Marco Peloso; Angelo Ricciardone; Caner Unal

    2014-07-30T23:59:59.000Z

    Solid inflation is an effective field theory of inflation in which isotropy and homogeneity are accomplished via a specific combination of anisotropic sources (three scalar fields that individually break isotropy). This results in specific observational signatures that are not found in standard models of inflation: a non-trivial angular dependence for the squeezed bispectrum, and a possibly long period of anisotropic inflation (to drive inflation, the "solid" must be very insensitive to any deformation, and thus background anisotropies are very slowly erased). In this paper we compute the expected level of statistical anisotropy in the power spectrum of the curvature perturbations of this model. To do so, we account for the classical background values of the three scalar fields that are generated on large (superhorizon) scales during inflation via a random walk sum, as the perturbation modes leave the horizon. Such an anisotropy is unavoidably generated, even starting from perfectly isotropic classical initial conditions. The expected level of anisotropy is related to the duration of inflation and to the amplitude of the squeezed bispectrum. If this amplitude is close to its current observational limit (so that one of the most interesting predictions of the model can be observed in the near future), we find that a level of statistical anisotropy $\\gtrsim 3\\%$ in the power spectrum is to be expected, if inflation lasted $\\gtrsim 20-30$ e-folds more than the final $50-60$ efolds required to generare the CMB modes. We also comment and point out various similarities between solid inflation and models of inflation where a suitable coupling of the inflaton to a vector kinetic term $F^{2}$ gives frozen and scale invariant vector perturbations on superhorizon scales.

  11. Attractors, Universality and Inflation

    E-Print Network [OSTI]

    Sean Downes; Bhaskar Dutta; Kuver Sinha

    2012-07-27T23:59:59.000Z

    Studies of the initial conditions for inflation have conflicting predictions from exponential suppression to inevitability. At the level of phase space, this conflict arises from the competing intuitions of CPT invariance and thermodynamics. After reviewing this conflict, we enlarge the ensemble beyond phase space to include scalar potential data. We show how this leads to an important contribution from inflection point inflation, enhancing the likelihood of inflation to an inverse cubic power law. In the process, we emphasize the attractor dynamics of the gravity-scalar system and the existence of universality classes from inflection point inflation. Finally, we comment on the predictivity of inflation in light of these results.

  12. Predictions From Eternal Inflation

    E-Print Network [OSTI]

    Leichenauer, Stefan

    2011-01-01T23:59:59.000Z

    Renata Kallosh, Andrei Linde, and Sandip P. Trivedi. DeNemanja Kaloper and Andrei Linde. Cosmology vs. holography.?a-Bellido and Andrei D. Linde. Stationarity of inflation

  13. Is sustainability important to you? Interested in a career in energy? Register now for the second annual Business Response to Climate Change. This year's

    E-Print Network [OSTI]

    Vertes, Akos

    Is sustainability important to you? Interested in a career in energy? Register now for the second top organizations specializing in energy and sustainability. Highlights: · Morning session: Keynote with representatives from leading Energy employers in the national capital area including o Pace Global Energy Services

  14. Preheating in new inflation

    SciTech Connect (OSTI)

    Desroche, Mariel; Felder, Gary N. [Department of Physics, Clark Science Center, Smith College, Northampton, Massachusetts 01063 (United States); Kratochvil, Jan M.; Linde, Andrei [Department of Physics, Stanford University, Stanford, California 94305-4060 (United States)

    2005-05-15T23:59:59.000Z

    During the last ten years a detailed investigation of preheating was performed for chaotic inflation and for hybrid inflation. However, nonperturbative effects during reheating in the new inflation scenario remained practically unexplored. We investigate preheating in new inflation, using a combination of analytical and numerical methods. We find that the decay of the homogeneous component of the inflaton field and the resulting process of spontaneous symmetry breaking in the simplest models of new inflation usually occurs almost instantly: for the new inflation on the GUT scale it takes only about 5 oscillations of the field distribution. The decay of the homogeneous inflaton field is so efficient because of a combined effect of tachyonic preheating and parametric resonance. At that stage, the homogeneous oscillating inflaton field decays into a collection of waves of the inflaton field, with a typical wavelength of the order of the inverse inflaton mass. This stage usually is followed by a long stage of decay of the inflaton field into other particles, which can be described by the perturbative approach to reheating after inflation. The resulting reheating temperature typically is rather low.

  15. Saving Natural Inflation

    E-Print Network [OSTI]

    Djuna Croon; Veronica Sanz

    2015-01-12T23:59:59.000Z

    Slow-roll inflation requires the inflaton field to have an exceptionally flat potential, which combined with measurements of the scale of inflation demands some degree of fine-tuning. Alternatively, the flatness of the potential could be due to the inflaton's origin as a pseudo-Goldstone boson, as in Natural Inflation. Alas, consistency with Planck data places the original proposal of Natural Inflation in a tight spot, as it requires a trans-Planckian excursion of the inflaton. Although one can still tune the renormalizable potential to sub-Planckian values, higher order corrections from quantum gravity or sources of breaking of the Goldstone symmetry would ruin the predictivity of the model. In this paper we show how in more realistic models of Natural Inflation one could achieve inflation without a trans-Planckian excursion of the field. We show how a variant of Extra-natural inflation with bulk fermions can achieve the desired goal and discuss its four-dimensional duals. We also present a new type of four dimensional models inspired in Little Higgs and Composite Higgs models which can lead to sub-Planckian values of the inflaton field.

  16. Natural warm inflation

    SciTech Connect (OSTI)

    Visinelli, Luca, E-mail: u0583682@utah.edu [Department of Physics and Astronomy, University of Utah, 115 South 1400 East 201, Salt Lake City, Utah 84112-0830 (United States)

    2011-09-01T23:59:59.000Z

    We derive the requirements that a generic axion-like field has to satisfy in order to play the role of the inflaton field in the warm inflation scenario. Compared to the parameter space in ordinary Natural Inflation models, we find that the parameter space in our model is enlarged. In particular, we avoid the problem of having an axion decay constant f that relates to the Planck scale, which is instead present in the ordinary Natural Inflation models; in fact, our model can easily accommodate values of the axion decay constant that lie well below the Planck scale.

  17. Interest Theory Richard C. Penney Purdue University

    E-Print Network [OSTI]

    2007-09-19T23:59:59.000Z

    We recommend the TI BA II Plus, either the solar or battery version. .... per year. Bank A compounds yearly but uses simple interest for partial periods ..... (29) Assuming that house prices have inflated at an average rate of 8% per year for each ...

  18. Interest Theory Richard C. Penney Purdue University

    E-Print Network [OSTI]

    1910-30-42T23:59:59.000Z

    arial Exam. We recommend the TI BA II Plus, either the solar or battery version. .... Bank A compounds yearly but uses simple interest for partial periods while bank ..... Assuming that house prices have inflated at an average rate of 8% per year.

  19. Large-Field Inflation and Supersymmetry Breaking

    E-Print Network [OSTI]

    Wilfried Buchmuller; Emilian Dudas; Lucien Heurtier; Clemens Wieck

    2014-07-14T23:59:59.000Z

    Large-field inflation is an interesting and predictive scenario. Its non-trivial embedding in supergravity was intensively studied in the recent literature, whereas its interplay with supersymmetry breaking has been less thoroughly investigated. We consider the minimal viable model of chaotic inflation in supergravity containing a stabilizer field, and add a Polonyi field. Furthermore, we study two possible extensions of the minimal setup. We show that there are various constraints: first of all, it is very hard to couple an O'Raifeartaigh sector with the inflaton sector, the simplest viable option being to couple them only through gravity. Second, even in the simplest model the gravitino mass is bounded from above parametrically by the inflaton mass. Therefore, high-scale supersymmetry breaking is hard to implement in a chaotic inflation setup. As a separate comment we analyze the simplest chaotic inflation construction without a stabilizer field, together with a supersymmetrically stabilized Kahler modulus. Without a modulus, the potential of such a model is unbounded from below. We show that a heavy modulus cannot solve this problem.

  20. dark matter dark energy inflation

    E-Print Network [OSTI]

    Hu, Wayne

    theory dark matter dark energy inflation The National Science Foundation The Kavli Foundation NSF Site Review November 28-29, 2005 #12;dark matter dark energy inflation NSF Site Visit ­ November 28 Gravitation initial conditions beyond single-field slow roll #12;dark matter dark energy inflation NSF Site

  1. Holographic Inflation Revised

    E-Print Network [OSTI]

    Tom Banks; Willy Fischler

    2015-01-09T23:59:59.000Z

    This paper is a major revision of our previous work on the HST model of inflation. We identify the local fluctuations of the metric with fluctuations of the mass and angular momentum of black holes, and show that the consistency conditions in HST for a single trajectory to see more and more of a homogeneous distribution of black holes, imply that the system outside the horizon is undergoing inflation: small systems of equal entropy, are not in causal contact. Homogeneity then requires that the initial trajectory underwent inflation that expanded the black hole radius into our current horizon. The low entropy of the initial state of the universe is explained by the fact that this is the maximal entropy state, which has long lived localized excitations, and which can form structures more complex than black holes. The number of e-folds, reheat temperature of the universe and size of inflationary fluctuations are calculated in terms of a few parameters.

  2. Inflation After WMAP

    E-Print Network [OSTI]

    William H. Kinney

    2004-06-29T23:59:59.000Z

    I examine the status of inflationary cosmology in light of the first-year data from the WMAP satellite, focusing on the simplest models of inflation: those driven by a single scalar field. The WMAP observation of the Cosmic Microwave Background is the first unified, self-consistent data set capable of putting meaningful constraints on the inflationary parameter space. WMAP provides significant support for the inflationary paradigm in general, and single-field slow-roll inflation models provide a good fit to existing observational constraints.

  3. Can inflation solve the hierarchy problem?

    SciTech Connect (OSTI)

    Biswas, Tirthabir; Notari, Alessio [Physics Department, McGill University, 3600 University Road, Montreal, QC, H3A 2T8 (Canada)

    2006-08-15T23:59:59.000Z

    Inflation with tunneling from a false to a true vacuum becomes viable in the presence of a scalar field that slows down the initial de Sitter phase. As a by-product this field also sets dynamically the value of M{sub Planck} observed today. This can be very large if the tunneling rate (which is exponentially sensitive to the barrier) is small enough. Therefore along with inflation we also provide a natural dynamical explanation for why gravity is so weak today. Moreover we predict a spectrum of gravity waves peaked at around 0.1 mHz, that will be detectable by the planned space interferometer LISA. Finally we discuss interesting predictions on cosmological scalar and tensor fluctuations in light of the WMAP 3-year data.

  4. Remote Inflation as hybrid-like sneutrino/MSSM inflation

    E-Print Network [OSTI]

    Tomohiro Matsuda

    2009-07-03T23:59:59.000Z

    A new scenario of hybrid-like inflation is considered for sneutrino and MSSM fields. Contrary to the usual hybrid inflation model, the direct coupling between a trigger field and the sneutrino/MSSM inflaton field is not necessary for the scenario. The dissipation and the radiation from the sneutrino/MSSM inflaton can be written explicitly by using the Yukawa couplings. Remote inflation does not require the shift symmetry or cancellation in solving the eta-problem.

  5. Quantum Gravity and Inflation

    E-Print Network [OSTI]

    M. G. Romania; N. C. Tsamis; R. P. Woodard

    2014-12-05T23:59:59.000Z

    We review some perturbative results obtained in quantum gravity in an accelerating cosmological background. We then describe a class of non-local, purely gravitational models which have the correct structure to reproduce the leading infrared logarithms of quantum gravitational back-reaction during the inflationary regime. These models end inflation in a distinctive phase of oscillations with slight and short violations of the weak energy condition and should, when coupled to matter, lead to rapid reheating. By elaborating this class of models we exhibit one that has the same behaviour during inflation, goes quiescent until the onset of matter domination, and induces a small, positive cosmological constant of about the right size thereafter. We also briefly comment on the primordial density perturbations that this class of models predict.

  6. 'Graceful' old inflation

    SciTech Connect (OSTI)

    Di Marco, Fabrizio; Notari, Alessio [Dipartimento di Fisica, Universita degli Studi di Bologna and INFN via Irnerio, 46-40126, Bologna (Italy); Physics Department, McGill University, 3600 University Road, Montreal, Quebec City, H3A 2T8 (Canada)

    2006-03-15T23:59:59.000Z

    We show that inflation in a false vacuum becomes viable in the presence of a spectator scalar field nonminimally coupled to gravity. The field is unstable in this background; it grows exponentially and slows down the pure de Sitter phase itself, allowing then fast tunneling to a true vacuum. We compute the constraint from graceful exit through bubble nucleation and the spectrum of cosmological perturbations.

  7. Inflation and Braneworlds

    E-Print Network [OSTI]

    James E. Lidsey

    2003-05-28T23:59:59.000Z

    An introductory review of the Randall-Sundrum type II braneworld scenario is presented, with emphasis on the relationship between the density and gravitational wave perturbations that are generated during inflation. The implications of relaxing the reflection symmetry in the fifth dimension are considered. The effects of including a Gauss-Bonnet combination of higher-order curvature invariants in the bulk action are briefly discussed.

  8. Inflation Driven by Unification Energy

    E-Print Network [OSTI]

    Mark P. Hertzberg; Frank Wilczek

    2014-07-22T23:59:59.000Z

    We examine the hypothesis that inflation is primarily driven by vacuum energy at a scale indicated by gauge coupling unification. Concretely, we consider a class of hybrid inflation models wherein the vacuum energy associated with a grand unified theory condensate provides the dominant energy during inflation, while a second "inflaton" scalar slow-rolls. We show that it is possible to obtain significant tensor-to-scalar ratios while fitting the observed spectral index.

  9. Holography of Little Inflation

    E-Print Network [OSTI]

    McInnes, Brett

    2015-01-01T23:59:59.000Z

    For several crucial microseconds of its early history, the Universe consisted of a Quark-Gluon Plasma. As it cooled during this era, it traced out a trajectory in the quark matter phase diagram. The form taken by this trajectory is not known with certainty, but is of great importance: it determines, for example, whether the cosmic plasma passed through a first-order phase change during the transition to the hadron era, as has recently been suggested by advocates of the "Little Inflation" model. Just before this transition, the plasma was strongly coupled and therefore can be studied by holographic techniques. We show that holography imposes a strong constraint (taking the form of a bound on the baryonic chemical potential relative to the temperature) on the domain through which the cosmic plasma could pass as it cooled, with important consequences for Little Inflation. In fact, we find that holography applied to Little Inflation implies that the cosmic plasma must have passed quite close to the quark matter c...

  10. Holography of Little Inflation

    E-Print Network [OSTI]

    Brett McInnes

    2015-03-18T23:59:59.000Z

    For several crucial microseconds of its early history, the Universe consisted of a Quark-Gluon Plasma. As it cooled during this era, it traced out a trajectory in the quark matter phase diagram. The form taken by this trajectory is not known with certainty, but is of great importance: it determines, for example, whether the cosmic plasma passed through a first-order phase change during the transition to the hadron era, as has recently been suggested by advocates of the "Little Inflation" model. Just before this transition, the plasma was strongly coupled and therefore can be studied by holographic techniques. We show that holography imposes a strong constraint (taking the form of a bound on the baryonic chemical potential relative to the temperature) on the domain through which the cosmic plasma could pass as it cooled, with important consequences for Little Inflation. In fact, we find that holography applied to Little Inflation implies that the cosmic plasma must have passed quite close to the quark matter critical point, and might therefore have been affected by the associated fluctuation phenomena.

  11. New Old Inflation

    SciTech Connect (OSTI)

    Dvali, Gia

    2003-10-03T23:59:59.000Z

    We propose a new class of inflationary solutions to the standard cosmological problems (horizon, flatness, monopole,...), based on a modification of old inflation. These models do not require a potential which satisfies the normal inflationary slow-roll conditions. Our universe arises from a single tunneling event as the inflaton leaves the false vacuum. Subsequent dynamics (arising from either the oscillations of the inflaton field or thermal effects) keep a second field trapped in a false minimum, resulting in an evanescent period of inflation (with roughly 50 e-foldings) inside the bubble. This easily allows the bubble to grow sufficiently large to contain our present horizon volume. Reheating is accomplished when the inflaton driving the last stage of inflation rolls down to the true vacuum, and adiabatic density perturbations arise from moduli-dependent Yukawa couplings of the inflaton to matter fields. Our scenario has several robust predictions, including virtual absence of gravity waves, a possible absence of tilt in scalar perturbations, and a higher degree of non-Gaussianity than other models. It also naturally incorporates a solution to the cosmological moduli problem.

  12. Modelling Quintessential Inflation with Branes

    E-Print Network [OSTI]

    Konstantinos Dimopoulos

    2002-10-17T23:59:59.000Z

    I discuss why quintessential inflation model-building is more natural in the context of brane cosmology and study the dynamics of a particular model as an example.

  13. Demonstration program for coal-oil mixture combustion in an electric utility boiler - Category III A. 1978 annual report

    SciTech Connect (OSTI)

    Not Available

    1980-04-01T23:59:59.000Z

    The 1978 annual report covers New England Power Service Company's participation in the Department of Energy coal-oil mixture (COM) program. Continued world-wide unrest resulting in an unstable fuel oil supply coupled with rapidly inflating costs have caused continued interest in a demonstrable viable solution. NEPSCO's program, while not attaining all the milestones forecast, has made considerable progress. As of January 31, 1979, ninety-five (95% percent of engineering and design has been completed. Construction of facilities and installation of required equipment was approximately 75% complete and the six-week Feasibility Testing program was expected to commence during April 1979.

  14. Testing Inflation: A Bootstrap Approach

    E-Print Network [OSTI]

    Latham Boyle; Paul J. Steinhardt

    2010-10-08T23:59:59.000Z

    We note that the essential idea of inflation, that the universe underwent a brief period of accelerated expansion followed by a long period of decelerated expansion, can be encapsulated in a "closure condition" which relates the amount of accelerated expansion during inflation to the amount of decelerated expansion afterward. We present a protocol for systematically testing the validity of this condition observationally.

  15. Inflation in supersymmetric SU(5)

    SciTech Connect (OSTI)

    Khalil, S. [Ain Shams University, Faculty of Science, Cairo, 11566 (Egypt); Center for Theoretical Physics at the British University in Egypt, Sherouk City, Cairo 11837 (Egypt); Rehman, M. U.; Shafi, Q. [Bartol Research Institute, Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States); Zaakouk, E. A. [Ain Shams University, Faculty of Science, Cairo, 11566 (Egypt)

    2011-03-15T23:59:59.000Z

    We analyze the adjoint field inflation in supersymmetric (SUSY) SU(5) model. In minimal SUSY SU(5) hybrid inflation monopoles are produced at the end of inflation. We therefore explore the nonminimal model of inflation based on SUSY SU(5), like shifted hybrid inflation, which provides a natural solution for the monopole problem. We find that the supergravity corrections with nonminimal Kaehler potential are crucial to realize the central value of the scalar spectral index n{sub s{approx_equal}}0.96 consistent with the 7 yr WMAP data. The tensor to scalar ratio r is quite small, taking on values r < or approx. 10{sup -5}. Because of R symmetry massless SU(3) octet and SU(2) triplet supermultiplets are present and could spoil gauge coupling unification. To keep gauge coupling unification intact, light vectorlike particles are added which are expected to be observed at LHC.

  16. Inflation in a web

    SciTech Connect (OSTI)

    Li Sheng; Piao Yunsong [College of Physical Sciences, Graduate School of Chinese Academy of Sciences, Beijing 100049 (China); Liu Yang [College of Physical Sciences, Graduate School of Chinese Academy of Sciences, Beijing 100049 (China); Department of Physics, Shandong University, Jinan 250100 (China)

    2009-12-15T23:59:59.000Z

    In a given path with multiple branches, in principle, it can be expected that there are some fork points, where one branch is bifurcated into different branches, or various branches converge into one or several branches. In this paper, it is shown that if there is a web formed by such branches in a given field space, in which each branch can be responsible for a period of slow roll inflation, a multiverse separated by a domain wall network will come into being, some of which might correspond to our observable universe. We discuss this scenario and show possible observations of a given observer at late time.

  17. Consistent generation of magnetic fields in axion inflation models

    E-Print Network [OSTI]

    Fujita, Tomohiro; Tada, Yuichiro; Takeda, Naoyuki; Tashiro, Hiroyuki

    2015-01-01T23:59:59.000Z

    There has been a growing evidence for the existence of magnetic fields in the extra-galactic regions, while the attempt to associate their origin with the inflationary epoch alone has been found extremely challenging. We therefore take into account the consistent post-inflationary evolution of the magnetic fields that are originated from vacuum fluctuations during inflation. In the model of our interest, the electromagnetic (EM) field is coupled to a pseudo-scalar inflaton $\\phi$ through the characteristic term $\\phi F\\tilde F$, breaking the conformal invariance. This interaction dynamically breaks the parity and enables a continuous production of only one of the polarization states of the EM field through tachyonic instability. The produced magnetic fields are thus helical. We find that the dominant contribution to the observed magnetic fields in this model comes from the modes that leave the horizon near the end of inflation, further enhanced by the tachyonic instability right after the end of inflation. Th...

  18. Hints of Universality from Inflection Point Inflation 

    E-Print Network [OSTI]

    Downes, Sean Donovan

    2013-07-25T23:59:59.000Z

    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 II.2.1 Old Inflation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 II.2.2 Chaotic Inflation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 II.2.3 Inflection Point Inflation... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 III.3.1 Scales of SUSY Breaking and Inflation . . . . . . . . . . . . . . . . . . . . . . . 22 III.3.2 A Simple Realization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 III.4 What We Talk About When We Talk About...

  19. Hints of Universality from Inflection Point Inflation

    E-Print Network [OSTI]

    Downes, Sean Donovan

    2013-07-25T23:59:59.000Z

    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 II.2.1 Old Inflation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 II.2.2 Chaotic Inflation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 II.2.3 Inflection Point Inflation... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 III.3.1 Scales of SUSY Breaking and Inflation . . . . . . . . . . . . . . . . . . . . . . . 22 III.3.2 A Simple Realization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 III.4 What We Talk About When We Talk About...

  20. Observing alternatives to inflation

    E-Print Network [OSTI]

    P. Peter

    2009-12-07T23:59:59.000Z

    We discuss the possibility that the inflationary paradigm, undoubtfully today's best framework to understand all the present cosmological data, may still have some viable challengers. The underlying idea for such discussions is that although inflation already passed quite a large number of tests, indeed enough to make it part of the so-called ``standard model'' of cosmology, it has always been through indirect measurements: there is not a chance that we may ever directly check its validity, and therefore, in order to assert its factuality with increasing level of confidence, it is required that we compare its predictions not only to observations, but also to as many contenders as possible. Among other categories of possible models, we wish to put the emphasis in particular on bouncing cosmologies that, however not as complete as the inflation paradigm might be, could still represent a reasonnable way of explaining the current data. Hopefully, future data will be able to discriminate between these various sets of theories.

  1. Quantum black hole inflation

    E-Print Network [OSTI]

    M. B. Altaie

    2001-05-07T23:59:59.000Z

    In this paper we follow a new approach for particle creation by a localized strong gravitational field. The approach is based on a definition of the physical vacuum drawn from Heisenberg uncertainty principle. Using the fact that the gravitational field red-shifts the frequency modes of the vacuum, a condition on the minimum stregth of the gravitational field required to achieve real particle creation is derived. Application of this requirement on a Schwartzchid black hole resulted in deducing an upper limit on the region, outside the event horizon, where real particles can be created. Using this regional upper limit, and considering particle creation by black holes as a consequence of the Casimir effect, with the assumption that the created quanta are to be added to the initial energy, we deduce a natural power law for the development of the event horizon, and consequently a logarithmic law for the area spectrum of an inflating black hole. Application of the results on a cosmological model shows that if we start with a Planck-dimensional black hole, then through the process of particle creation we end up with a universe having the presently estimated critical density. Such a universe will be in a state of eternal inflation.

  2. Extended inflation with induced gravity

    SciTech Connect (OSTI)

    Accetta, F. S.; Trester, J. J.

    1989-05-15T23:59:59.000Z

    We consider a recently proposed extended model of inflation which improves upon the original old inflation scenario by achieving a graceful exit from the false-vacuum phase. In this paper extended inflation is generalized to include a potential /ital V/(/phi/) for the Brans-Dicke-type field /phi/. We find that whereas a graceful exit can still be had, the inclusion of a potential places constraints on the percolation time scale for exiting the inflationary phase. Additional constraints on /ital V/(/phi/) and the false-vacuum energy density /rho//sub /ital F// from density and gravitational-wave perturbations are discussed. For initially small values of /phi/ the false vacuum undergoes power-law inflation, while for initially large values of /phi/ the expansion is exponential. Within true-vacuum regions slow-rolling inflation can occur. As a result, this model generically leads to multiple episodes of inflation. We discuss the significance these multiple episodes of inflation may have on the formation of large-scale structure and the production of voids.

  3. Natural Inflation and Quantum Gravity

    E-Print Network [OSTI]

    Anton de la Fuente; Prashant Saraswat; Raman Sundrum

    2015-01-29T23:59:59.000Z

    Cosmic Inflation provides an attractive framework for understanding the early universe and the cosmic microwave background. It can readily involve energies close to the scale at which Quantum Gravity effects become important. General considerations of black hole quantum mechanics suggest nontrivial constraints on any effective field theory model of inflation that emerges as a low-energy limit of quantum gravity, in particular the constraint of the Weak Gravity Conjecture. We show that higher-dimensional gauge and gravitational dynamics can elegantly satisfy these constraints and lead to a viable, theoretically-controlled and predictive class of Natural Inflation models.

  4. False Vacuum Decay after Inflation

    E-Print Network [OSTI]

    T. Asaka; W. Buchmuller; L. Covi

    2001-04-03T23:59:59.000Z

    Inflation is terminated by a non-equilibrium process which finally leads to a thermal state. We study the onset of this transition in a class of hybrid inflation models. The exponential growth of tachyonic modes leads to decoherence and spinodal decomposition. We compute the decoherence time, the spinodal time, the size of the formed domains and the homogeneous classical fields within a single domain.

  5. The Interest Rate Conundrum

    E-Print Network [OSTI]

    Craine, Roger; Martin, Vance L.

    2009-01-01T23:59:59.000Z

    Flows and US Interest Rates,” NBER Working Paper No 12560. [Working Paper # 2008 -03 The Interest Rate Conundrum Roger

  6. 2001 annual report 2001 annual report

    E-Print Network [OSTI]

    New Mexico, University of

    2001 annual report 2001 annual report 2001 annual report 2001 annual report 2001 annual report 2001 annual report 2001 annual report 2001 annual reportelectrical & computer engineering 2001 annual report the university of new mexico department of 2001 annual report 2001 annual report 2001 annual report 2001 annual

  7. Two tunnels to inflation

    SciTech Connect (OSTI)

    Aguirre, Anthony; Johnson, Matthew C. [Department of Physics, University of California, Santa Cruz, California 95064 (United States)

    2006-06-15T23:59:59.000Z

    We investigate the formation via tunneling of inflating (false-vacuum) bubbles in a true-vacuum background, and the reverse process. Using effective potentials from the junction condition formalism, all true- and false-vacuum bubble solutions with positive interior and exterior cosmological constant, and arbitrary mass are catalogued. We find that tunneling through the same effective potential appears to describe two distinct processes: one in which the initial and final states are separated by a wormhole (the Farhi-Guth-Guven mechanism), and one in which they are either in the same hubble volume or separated by a cosmological horizon. In the zero-mass limit, the first process corresponds to the creation of an inhomogenous universe from nothing, while the second mechanism is equivalent to the nucleation of true- or false-vacuum Coleman-De Luccia bubbles. We compute the probabilities of both mechanisms in the WKB approximation using semiclassical Hamiltonian methods, and find that--assuming both process are allowed--neither mechanism dominates in all regimes.

  8. The measure problem in eternal inflation

    E-Print Network [OSTI]

    De Simone, Andrea, Ph. D. Massachusetts Institute of Technology

    2010-01-01T23:59:59.000Z

    Inflation is a paradigm for the physics of the early universe, and it has received a great deal of experimental support. Essentially all inflationary models lead to a regime called eternal inflation, a situation where ...

  9. Spatial curvature falsifies eternal inflation

    SciTech Connect (OSTI)

    Kleban, Matthew; Schillo, Marjorie, E-mail: mk161@nyu.edu, E-mail: mls604@nyu.edu [Center for Cosmology and Particle Physics, New York University, 4 Washington Place, New York (United States)

    2012-06-01T23:59:59.000Z

    Inflation creates large-scale cosmological density perturbations that are characterized by an isotropic, homogeneous, and Gaussian random distribution about a locally flat background. Even in a flat universe, the spatial curvature measured within one Hubble volume receives contributions from long wavelength perturbations, and will not in general be zero. These same perturbations determine the Cosmic Microwave Background (CMB) temperature fluctuations, which are O(10{sup ?5}). Consequently, the low-l multipole moments in the CMB temperature map predict the value of the measured spatial curvature ?{sub k}. On this basis we argue that a measurement of |?{sub k}| > 10{sup ?4} would rule out slow-roll eternal inflation in our past with high confidence, while a measurement of ?{sub k} < ?10{sup ?4} (which is positive curvature, a locally closed universe) rules out false-vacuum eternal inflation as well, at the same confidence level. In other words, negative curvature (a locally open universe) is consistent with false-vacuum eternal inflation but not with slow-roll eternal inflation, and positive curvature falsifies both. Near-future experiments will dramatically extend the sensitivity of ?{sub k} measurements and constitute a sharp test of these predictions.

  10. False Vacuum Chaotic Inflation: The New Paradigm?

    E-Print Network [OSTI]

    David H. Lyth; Ewan D. Stewart

    1994-08-19T23:59:59.000Z

    Recent work is reported on inflation model building in the context of supergravity and superstrings, with special emphasis on False Vacuum (`Hybrid') Chaotic Inflation. Globally supersymmetric models do not survive in generic supergravity theories, but fairly simple conditions can be formulated which do ensure successful supergravity inflation. The conditions are met in some of the versions of supergravity that emerge from superstrings.

  11. From Inflation to Dark Energy

    E-Print Network [OSTI]

    Robert Brout

    2005-08-04T23:59:59.000Z

    It is proposed that after the macroscopic fluctuation of energy density that is responsible for inflation dies away, a class of microscopic fluctuations, always present, survives to give the present day dark energy. This latter is simply a reinterpretation of the causet mechanism of Ahmed, Dodelson, Green and Sorkin, wherein the emergence of space is dropped but only energy considerations are maintained. At postinflation times, energy is exchanged between the "cisplanckian" cosmos and an unknown foam-like transplanckian reservoir. Whereas during inflation, the energy flows only from the latter to the former after inflation it fluctuates in sign thereby accounting for the tiny effective cosmological constant that seems to account for dark energy.

  12. Universality class in conformal inflation

    SciTech Connect (OSTI)

    Kallosh, Renata; Linde, Andrei, E-mail: kallosh@stanford.edu, E-mail: alinde@stanford.edu [Department of Physics and SITP, Stanford University, Stanford, California 94305 (United States)

    2013-07-01T23:59:59.000Z

    We develop a new class of chaotic inflation models with spontaneously broken conformal invariance. Observational consequences of a broad class of such models are stable with respect to strong deformations of the scalar potential. This universality is a critical phenomenon near the point of enhanced symmetry, SO(1,1), in case of conformal inflation. It appears because of the exponential stretching of the moduli space and the resulting exponential flattening of scalar potentials upon switching from the Jordan frame to the Einstein frame in this class of models. This result resembles stretching and flattening of inhomogeneities during inflationary expansion. It has a simple interpretation in terms of velocity versus rapidity near the Kähler cone in the moduli space, similar to the light cone of special theory of relativity. This effect makes inflation possible even in the models with very steep potentials. We describe conformal and superconformal versions of this cosmological attractor mechanism.

  13. Corpuscular Consideration of Eternal Inflation

    E-Print Network [OSTI]

    Kuhnel, Florian

    2015-01-01T23:59:59.000Z

    We review the paradigm of eternal inflation in the light of the recently proposed corpuscular picture of space-time. Comparing the strength of the average fluctuation of the field up its potential with that of quantum depletion, we show that the latter can be dominant. We then study the full respective distributions in order to show that the fraction of the space-time which has an increasing potential is always below the eternal-inflation threshold. We prove that for monomial potentials eternal inflaton is excluded. This is likely to hold for other models as well.

  14. Privatizing Public Interest Law

    E-Print Network [OSTI]

    Cummings, Scott L

    2011-01-01T23:59:59.000Z

    graduation, she received a public interest law foundation grant to work in the consumer rights project

  15. Supergravity chaotic inflation and moduli stabilization

    SciTech Connect (OSTI)

    Davis, S C [Service de Physique Theorique, Orme des Merisiers, CEA/Saclay, 91191 Gif-sur-Yvette Cedex (France); Postma, M, E-mail: sdavis@lorentz.leidenuniv.nl, E-mail: mpostma@nikhef.nl, E-mail: postma@mail.desy.de [DESY, Notkestrasse 85, 22607 Hamburg (Germany)

    2008-03-15T23:59:59.000Z

    Chaotic inflation predicts a large gravitational wave signal which can be tested by the upcoming Planck satellite. We discuss a supergravity implementation of chaotic inflation in the presence of moduli fields, and find that inflation does not work with a generic Kachru-Kallosh-Linde-Trivedi moduli stabilization potential. A viable model can be constructed with a fine-tuned moduli sector, but only for a very specific choice of Kaehler potential. Our analysis also shows that inflation models satisfying {partial_derivative}{sub i}W{sub inf}=0 for all inflation sector fields {phi}{sub i} can be combined successfully with a fine-tuned moduli sector.

  16. Cosmological perturbations and noncommutative tachyon inflation

    SciTech Connect (OSTI)

    Liu Daojun; Li Xinzhou [Shanghai United Center for Astrophysics (SUCA), Shanghai Normal University, 100 Guilin Road, Shanghai 200234 (China) and Division of Astrophysics, E-institute of Shanghai Universities, Shanghai Normal University, 100 Guilin Road, Shanghai 200234 (China)

    2004-12-15T23:59:59.000Z

    The motivation for studying the rolling tachyon and noncommutative inflation comes from string theory. In the tachyon inflation scenario, metric perturbations are created by tachyon field fluctuations during inflation. We drive the exact mode equation for scalar perturbations of the metric and investigate the cosmological perturbations in the commutative and noncommutative inflationary spacetime driven by the tachyon field which have a Born-Infeld Lagrangian. Although at lowest order the predictions of tachyon inflation are no different than those from standard slow-roll inflation, due to the modified inflationary dynamics there exists modifications to the power spectra of fluctuations generated during inflation. In the noncommutative tachyon inflation scenario, the stringy noncommutativity of spacetime results in corrections to the primordial power spectrum that lead to a spectral index that is greater than 1 on large scales and less than 1 on small scales as the first-year results of the Wilkinson Microwave Anisotropy Probe indicate.

  17. Accidental inflation in string theory

    SciTech Connect (OSTI)

    Linde, Andrei; Westphal, Alexander, E-mail: alinde@stanford.edu, E-mail: awestpha@stanford.edu [Department of Physics, Stanford University, Stanford, CA 94305-4060 (United States)

    2008-03-15T23:59:59.000Z

    We show that inflation in type IIB string theory driven by the volume modulus can be realized in the context of the racetrack-based Kallosh-Linde model (KL) of moduli stabilization. Inflation here arises through the volume modulus slow-rolling down from a flat hilltop or inflection point of the scalar potential. This situation can be quite generic in the landscape, where by uplifting one of the two adjacent minima one can turn the barrier either into a flat saddle point or into an inflection point supporting eternal inflation. The resulting spectral index is tunable in the range of 0.93{approx}inflation. This consideration leads to a tentative prediction of the spectral index n{sub s} Almost-Equal-To 0.95 or 0.93, depending on whether the potential has a symmetry {phi}{yields}-{phi} or not.

  18. Letter of Interest Example

    Broader source: Energy.gov [DOE]

    Sample letter of interest describes the FEMP Call for Technical Services for American Recovery and Reinvestment Act funds.

  19. Multi-brid DBI Inflation

    E-Print Network [OSTI]

    Salomeh Khoeini-Moghaddam

    2014-11-13T23:59:59.000Z

    We extend multi-brid idea to multi-field separable model with non-canonical kinetic term. Considering a specific surface of end of inflation and introducing new fields, we find explicit expression for number of e-folds in terms of this new fields. Using $\\delta$N formalism we get cosmological parameters for this general case. We use our general results for DBI model in speed limit, comparison to observation gives numerical estimation for the parameters of the model.

  20. Inflation for Bianchi IX model

    E-Print Network [OSTI]

    R. Bergamini; P. Sedici; P. Verrocchio

    1996-11-29T23:59:59.000Z

    The influence of Inflation on initial (i.e. at Planck's epoch) large anisotropy of the Universe is studied, considering a more general metric than the isotropic one: the locally rotationally symmetric (L.R.S.) Bianchi IX metric. We find, then, a large set of initial conditions of intrinsic curvature and shear allowing an inflationary epoch that make the anisotropy negligible. These are not trivial because of the non-linearity of the Einstein's equations.

  1. Chaotic inflation and supersymmetry breaking

    SciTech Connect (OSTI)

    Kallosh, Renata; Linde, Andrei; Rube, Tomas [Stanford Institute of Theoretical Physics and Department of Physics, Stanford University, Stanford, California 94305 (United States); Olive, Keith A. [William I. Fine Theoretical Physics Institute, University of Minnesota, Minneapolis, Minnesota 55455 (United States)

    2011-10-15T23:59:59.000Z

    We investigate the recently proposed class of chaotic inflation models in supergravity with an arbitrary inflaton potential V({phi}). These models are extended to include matter fields in the visible sector and we employ a mechanism of supersymmetry breaking based on a particular phenomenological version of the KKLT mechanism (the KL model). We describe specific features of reheating in this class of models and show how one can solve the cosmological moduli and gravitino problems in this context.

  2. Open Inflation with Arbitrary False Vacuum Mass

    E-Print Network [OSTI]

    Martin Bucher; Neil Turok

    1995-03-21T23:59:59.000Z

    We calculate the power spectrum of adiabatic density perturbations in an open inflationary model in which inflation occurs in two stages. First an epoch of old inflation creates a large, smooth universe, solving the horizon and homogeneity problems. Then an open universe emerges through the nucleation of a single bubble, with constant density hypersurfaces inside the bubble having constant negative spatial curvature. An epoch of `slow roll' inflation, shortened to give $\\Omega _0false vacuum.

  3. Inflation on an Open Racetrack

    SciTech Connect (OSTI)

    Chen, Heng-Yu; /Wisconsin U., Madison; Hung, Ling-Yan; /Cambridge U., DAMTP; Shiu, Gary; /Wisconsin U., Madison /SLAC /Stanford U., Phys. Dept.

    2011-11-14T23:59:59.000Z

    We present a variant of warped D-brane inflation by incorporating multiple sets of holomorphically - embedded D7-branes involved in moduli stabilization with extent into a warped throat. The resultant D3-brane motion depends on the D7-brane configuration and the relative position of the D3-brane in these backgrounds. The non-perturbative moduli stabilization superpotential takes the racetrack form, but the additional D3-brane open string moduli dependence provides more flexibilities in model building. For concreteness, we consider D3-brane motion in the warped deformed conifold with the presence of multiple D7-branes, and derive the scalar potential valid for the entire throat. By explicit tuning of the microphysical parameters, we obtain inflationary trajectories near an inflection point for various D7-brane configurations. Moreover, the open racetrack potential admits approximate Minkowski vacua before uplifting. We demonstrate with a concrete D-brane inflation model where the Hubble scale during inflation can exceed the gravitino mass. Finally, the multiple sets of D7-branes present in this open racetrack setup also provides a mechanism to stabilize the D3-brane to metastable vacua in the intermediate region of the warped throat.

  4. Superconformal symmetry, NMSSM, and inflation

    SciTech Connect (OSTI)

    Ferrara, Sergio [Physics Department, Theory Unit, CERN, CH 1211, Geneva 23 (Switzerland); INFN - Laboratori Nazionali di Frascati, Via Enrico Fermi 40, 00044 Frascati (Italy); Kallosh, Renata; Linde, Andrei; Marrani, Alessio [Department of Physics, Stanford University, Stanford, California 94305 (United States); Van Proeyen, Antoine [Instituut voor Theoretische Fysica, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven (Belgium)

    2011-01-15T23:59:59.000Z

    We identify a particularly simple class of supergravity models describing superconformal coupling of matter to supergravity. In these models, which we call the canonical superconformal supergravity models, the kinetic terms in the Jordan frame are canonical, and the scalar potential is the same as in the global theory. The pure supergravity part of the total action has a local Poincare supersymmetry, whereas the chiral and vector multiplets coupled to supergravity have a larger local superconformal symmetry. The scale-free globally supersymmetric theories, such as the NMSSM with a scale-invariant superpotential, can be naturally embedded into this class of theories. After the supergravity embedding, the Jordan frame scalar potential of such theories remains scale free; it is quartic, it contains no mass terms, no nonrenormalizable terms, no cosmological constant. The local superconformal symmetry can be broken by additional terms, which, in the small field limit, are suppressed by the gravitational coupling. This can be achieved by introducing the nonminimal scalar-curvature coupling, and by taking into account interactions with a hidden sector. In this approach, the smallness of the mass parameters in the NMSSM may be traced back to the original superconformal invariance. This allows one to address the {mu} problem and the cosmological domain wall problem in this model, and to implement chaotic inflation in the NMSSM. We discuss the gravitino problem in the NMSSM inflation, as well as the possibility to obtain a broad class of new versions of chaotic inflation in supergravity.

  5. Inflection point inflation within supersymmetry

    SciTech Connect (OSTI)

    Enqvist, Kari [Physics Department and Helsinki Institute of Physics, FI-00014 University of Helsinki (Finland); Mazumdar, Anupam; Stephens, Philip, E-mail: kari.enqvist@helsinki.fi, E-mail: a.mazumdar@lancaster.ac.uk, E-mail: p.stephens@lancaster.ac.uk [Physics Department, Lancaster University, Lancaster, LA1 4YB (United Kingdom)

    2010-06-01T23:59:59.000Z

    We propose to address the fine tuning problem of inflection point inflation by the addition of extra vacuum energy that is present during inflation but disappears afterwards. We show that in such a case, the required amount of fine tuning is greatly reduced. We suggest that the extra vacuum energy can be associated with an earlier phase transition and provide a simple model, based on extending the SM gauge group to SU(3){sub C} × SU(2){sub L} × U(1){sub Y} × U(1){sub B?L}, where the Higgs field of U(1){sub B?L} is in a false vacuum during inflation. In this case, there is virtually no fine tuning of the soft SUSY breaking parameters of the flat direction which serves as the inflaton. However, the absence of radiative corrections which would spoil the flatness of the inflaton potential requires that the U(1){sub B?L} gauge coupling should be small with g{sub B?L} ? 10{sup ?4}.

  6. Web points of interest

    E-Print Network [OSTI]

    Web points of interest ... JUGGLING CLUB; The Lafayette Citizens Band Home Page; Harold Boas' incredible list of math and life resources on the WEB.

  7. Quantum Gravitational Effects on Massive Fermions during Inflation I

    E-Print Network [OSTI]

    S. P. Miao

    2012-12-03T23:59:59.000Z

    We compute the one loop graviton contribution to the self-energy of a very light fermion on a locally de Sitter background. This result can be used to study the effect that a small mass has on the propagation of fermions through the sea of infrared gravitons generated by inflation. We employ dimensional regularization and obtain a fully renormalized result by absorbing all divergences with BPHZ counterterms. An interesting technical aspect of this computation is the need for two noninvariant counterterms owing to the breaking of de Sitter invariance by our gauge condition.

  8. Mutated hybrid inflation in f(R,?R)-gravity

    SciTech Connect (OSTI)

    Iihoshi, Masao, E-mail: iihoshi@kiso.phys.se.tmu.ac.jp [Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397 (Japan)

    2011-02-01T23:59:59.000Z

    A new hybrid inflationary scenario in the context of f(R,?R)-gravity is proposed. Demanding the waterfall field to 'support the potential from below' [unlike the original proposal by Stewart in Phys. Lett. B 345, 414 (1995)], we demonstrate that the scalar potential is similar to that of the large-field chaotic inflation model proposed by Linde in Phys. Lett. B 129, 177 (1983). Inflationary observables are used to constrain the parameter space of our model; in the process, an interesting limit on the number of e-folds N is found.

  9. Inflation and Alternatives with Blue Tensor Spectra

    E-Print Network [OSTI]

    Yi Wang; Wei Xue

    2014-10-20T23:59:59.000Z

    We study the tilt of the primordial gravitational waves spectrum. A hint of blue tilt is shown from analyzing the BICEP2 and POLARBEAR data. Motivated by this, we explore the possibilities of blue tensor spectra from the very early universe cosmology models, including null energy condition violating inflation, inflation with general initial conditions, and string gas cosmology, etc. For the simplest G-inflation, blue tensor spectrum also implies blue scalar spectrum. In general, the inflation models with blue tensor spectra indicate large non-Gaussianities. On the other hand, string gas cosmology predicts blue tensor spectrum with highly Gaussian fluctuations. If further experiments do confirm the blue tensor spectrum, non-Gaussianity becomes a distinguishing test between inflation and alternatives.

  10. Attraction towards an inflection point inflation

    SciTech Connect (OSTI)

    Allahverdi, Rouzbeh [Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131 (United States); Dutta, Bhaskar [Department of Physics, Texas A and M University, College Station, Texas 77843-4242 (United States); Mazumdar, Anupam [Physics Department, Lancaster University, Lancaster, LA1 4YB (United Kingdom); Niels Bohr Institute, Blegdamsvej-17, Copenhagen-2100 (Denmark)

    2008-09-15T23:59:59.000Z

    Many models of high-energy physics possess metastable vacua. It is conceivable that the Universe can get trapped in such a false vacuum, irrespective of its origin and prior history, at an earlier stage during its evolution. The ensuing false vacuum inflation results in a cold and empty universe and has a generic graceful exit problem. We show that an inflection point inflation along the flat directions of the minimal supersymmetric standard model (MSSM) can resolve this graceful exit problem by inflating the bubble, which nucleates out of a false vacuum. The important point is that the initial condition for an MSSM inflation can be naturally realized, due to an attractor behavior toward the inflection point. We investigate these issues in detail and also present an example where metastable vacua, hence the false vacuum inflation, can happen within the MSSM.

  11. False Vacuum Inflation with a Quartic Potential

    E-Print Network [OSTI]

    David Roberts; Andrew R Liddle; David H Lyth

    1994-11-25T23:59:59.000Z

    We consider a variant of Hybrid Inflation, where inflation is driven by two interacting scalar fields, one of which has a `Mexican hat' potential and the other a quartic potential. Given the appropriate initial conditions one of the fields can be trapped in a false vacuum state, supported by couplings to the other field. The energy of this vacuum can be used to drive inflation, which ends when the vacuum decays to one of its true minima. Depending on parameters, it is possible for inflation to proceed via two separate epochs, with the potential temporarily steepening sufficiently to suspend inflation. We use numerical simulations to analyse the possibilities, and emphasise the shortcomings of the slow-roll approximation for analysing this scenario. We also calculate the density perturbations produced, which can have a spectral index greater than one.

  12. Thin slices of interest

    E-Print Network [OSTI]

    Madan, Anmol P. (Anmol Prem Prakash)

    2005-01-01T23:59:59.000Z

    In this thesis we describe an automatic human interest detector that uses speech, physiology, body movement, location and proximity information. The speech features, consisting of activity, stress, empathy and engagement ...

  13. Inflation in AdS/CFT

    SciTech Connect (OSTI)

    Freivogel, Ben; /Stanford U., Phys. Dept. /LBL, Berkeley; Hubeny, Veronika E.; /LBL, Berkeley /Durham U., Dept. of Math.; Maloney, Alexander; /Stanford U., Phys. Dept.; Myers, Rob; /Perimeter Inst. Theor. Phys. /Waterloo U.; Rangamani, Mukund; /LBL, Berkeley /Durham U., Dept. of Math.; Shenker, Stephen; /Stanford U., Phys. Dept.

    2005-10-07T23:59:59.000Z

    We study the realization of inflation within the AdS/CFT correspondence. We assume the existence of a string landscape containing at least one stable AdS vacuum and a (nearby) metastable de Sitter state. Standard arguments imply that the bulk physics in the vicinity of the AdS minimum is described by a boundary CFT. We argue that large enough bubbles of the dS phase, including those able to inflate, are described by mixed states in the CFT. Inflating degrees of freedom are traced over and do not appear explicitly in the boundary description. They nevertheless leave a distinct imprint on the mixed state. Analytic continuation allows us, in principle, to recover a large amount of nonperturbatively defined information about the inflating regime. Our work also shows that no scattering process can create an inflating region, even by quantum tunneling, since a pure state can never evolve into a mixed state under unitary evolution.We study the realization of inflation within the AdS/CFT correspondence. We assume the existence of a string landscape containing at least one stable AdS vacuum and a (nearby) metastable de Sitter state. Standard arguments imply that the bulk physics in the vicinity of the AdS minimum is described by a boundary CFT. We argue that large enough bubbles of the dS phase, including those able to inflate, are described by mixed states in the CFT. Inflating degrees of freedom are traced over and do not appear explicitly in the boundary description. They nevertheless leave a distinct imprint on the mixed state. Analytic continuation allows us, in principle, to recover a large amount of nonperturbatively defined information about the inflating regime. Our work also shows that no scattering process can create an inflating region, even by quantum tunneling, since a pure state can never evolve into a mixed state under unitary evolution.

  14. Amplitude of Perturbations from Inflation

    E-Print Network [OSTI]

    Leonard Parker

    2007-03-22T23:59:59.000Z

    The observed power spectrum of the cosmic microwave background (CMB) is consistent with inflationary cosmology, which predicts a nearly scale-invariant power spectrum of quantum fluctuations of the inflaton field as they exit the Hubble horizon during inflation. Here we report a very significant correction (of several orders of magnitude) to the predicted amplitude of the power spectrum. This correction does not alter the near scale-invariance of the spectrum, but is crucial for testing predictions of the Hubble parameter during inflation against the observed amplitude of the CMB power spectrum. This novel correction appears because, as we show, the subtractions that renormalize the short-wavelength ultraviolet divergences of the inflaton two-point function have a significant effect on the amplitude of that two-point function at the longer wavelengths characteristic of the Hubble horizon. Earlier conclusions in the literature that certain theories (such as grand unified theories) implied perturbations that were too large by several orders of magnitude will have to be reconsidered in light of the present result.

  15. A Natural Framework for Chaotic Inflation

    SciTech Connect (OSTI)

    Kaloper, Nemanja; Sorbo, Lorenzo [Department of Physics, University of California, Davis, California 95616 (United States); Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003 (United States)

    2009-03-27T23:59:59.000Z

    We show that inflation with a quadratic potential occurs naturally in theories where an axionlike field mixes with a 4-form. Such an axion is massive, with the mass which arises from the mixing being protected by the axion shift symmetry. The 4-form backgrounds break this symmetry spontaneously and comprise a minilandscape, where their fluxes can change by emission of membranes. Inflation can begin when the 4-form dominates the energy density. Eventually, this energy is reduced by membrane emission, and the axion can roll slowly towards its minimum, as in the simplest version of chaotic inflation.

  16. Inflation and New Agegraphic Dark Energy

    E-Print Network [OSTI]

    Cheng-Yi Sun; Rui-Hong Yue

    2011-04-23T23:59:59.000Z

    In the note, we extend the discussion of the new agegraphic dark energy (NADE) model to include the inflation stage. Usually, in the inflation models, for convenience the conformal time $\\eta$ is set to be zero at the end of inflation. This is incompatible with the NADE model since $\\eta=0$ indicates the divergence of NADE. To avoid the difficulty, we can redefine the conformal time as $\\eta+\\delta$. However, we find that the positive constant $\\delta$ must be so large that NADE can not become dominated at present time.

  17. Remote Inflation: Hybrid-like inflation without hybrid-type potential

    E-Print Network [OSTI]

    Tomohiro Matsuda

    2009-06-18T23:59:59.000Z

    A new scenario of hybrid-like inflation is considered without using hybrid-type potential. Radiation raised continuously by a dissipating inflaton field keeps symmetry restoration in a remote sector, and the false-vacuum energy of the remote sector dominates the energy density during inflation. Remote inflation is terminated when the temperature reaches the critical temperature, or when the slow-roll condition is violated. Without introducing a complex form of couplings, inflaton field may either roll-in (like a standard hybrid inflation) or roll-out (like an inverted-hybrid model or quintessential inflation) on arbitrary inflaton potential. Significant signatures of remote inflation can be observed in the spectrum caused by (1) the inhomogeneous phase transition in the remote sector, or (2) a successive phase transition in the remote sector. Remote inflation can predict strong amplification or suppression of small-scale perturbations without introducing multiple inflation. Since the inflaton may have a run-away potential, it is also possible to identify the inflaton with quintessence, without introducing additional mechanisms. Even if the false-vacuum energy is not dominated by the remote sector, the phase transition in the remote sector is possible during warm inflation, which may cause significant amplification/suppression of the curvature perturbations.

  18. Remote inflation: hybrid-like inflation without hybrid-type potential

    SciTech Connect (OSTI)

    Matsuda, Tomohiro, E-mail: matsuda@sit.ac.jp [Laboratory of Physics, Saitama Institute of Technology, Fusaiji, Okabe-machi, Saitama 369-0293 (Japan)

    2009-07-01T23:59:59.000Z

    A new scenario of hybrid-like inflation is considered without using hybrid-type potential. Radiation raised continuously by a dissipating inflaton field keeps symmetry restoration in a remote sector, and the false-vacuum energy of the remote sector dominates the energy density during inflation. Remote inflation is terminated when the temperature reaches the critical temperature, or when the slow-roll condition is violated. Without introducing a complex form of couplings, inflaton field may either roll-in (like a standard hybrid inflation) or roll-out (like an inverted-hybrid model or quintessential inflation) on arbitrary inflaton potential. Significant signatures of remote inflation can be observed in the spectrum caused by 1. the inhomogeneous phase transition in the remote sector, or; 2. a successive phase transition in the remote sector. Remote inflation can predict strong amplification or suppression of small-scale perturbations without introducing multiple inflation. Since the inflaton may have a run-away potential, it is also possible to identify the inflaton with quintessence, without introducing additional mechanisms. Even if the false-vacuum energy is not dominated by the remote sector, the phase transition in the remote sector is possible during warm inflation, which may cause significant amplification/suppression of the curvature perturbations.

  19. Inflation with High Derivative Couplings

    E-Print Network [OSTI]

    Bin Chen; Miao Li; Tower Wang; Yi Wang

    2006-11-23T23:59:59.000Z

    We study a class of generalized inflation models in which the inflaton is coupled to the Ricci scalar by a general $f(\\phi, R)$ term. The scalar power spectrum, the spectral index, the running of the spectral index, the tensor mode spectrum and a new consistency relation of the model are calculated. We discuss in detail the issues of how to diagonize the coupled perturbation equations, how to deal with an entropy-like source, and how to determine the initial condition by quantization. By studying some explicit models, we find that rich phenomena such as a blue scalar power spectrum, a large running of the spectral index, and a blue tensor mode spectrum can be obtained.

  20. Clustering Fossils in Solid Inflation

    E-Print Network [OSTI]

    Mohammad Akhshik

    2014-09-10T23:59:59.000Z

    In solid inflation the single field non-Gaussianity consistency condition is violated. As a result, the long tensor perturbation induces observable clustering fossils in the form of quardupole anisotropy in large scale structure power spectrum. In this work we revisit the bispectrum analysis for the scalar-scalar-scalar and tensor-scalar-scalar for the general parameter space of solid. We consider the parameter space of the model in which the level of non-Gaussianity generated is consistent with Planck constraints. Specializing to this allowed range of model parameter, we calculate the quadrupole anisotropy induced from the long tensor perturbations on the power spectrum of scalar perturbations. We argue that imprints of clustering fossil from primordial gravitational waves on large scale structures can be detected from the future galaxy surveys.

  1. Inflation from Broken Scale Invariance

    E-Print Network [OSTI]

    Csaba Csaki; Nemanja Kaloper; Javi Serra; John Terning

    2014-06-19T23:59:59.000Z

    We construct a model of inflation based on a low-energy effective theory of spontaneously broken global scale invariance. This provides a shift symmetry that protects the inflaton potential from quantum corrections. Since the underlying scale invariance is non-compact, arbitrarily large inflaton field displacements are readily allowed in the low-energy effective theory. A weak breaking of scale invariance by almost marginal operators provides a non-trivial inflaton minimum, which sets and stabilizes the final low-energy value of the Planck scale. The underlying scale invariance ensures that the slow-roll approximation remains valid over large inflaton displacements, and yields a scale invariant spectrum of perturbations as required by the CMB observations.

  2. Conformal Frame Dependence of Inflation

    E-Print Network [OSTI]

    Domènech, Guillem

    2015-01-01T23:59:59.000Z

    Physical equivalence between different conformal frames in scalar-tensor theory of gravity is a known fact. However, assuming that matter minimally couples to the metric of a particular frame, which we call the matter Jordan frame, the matter point of view of the universe may vary from frame to frame. Thus, there is a clear distinction between gravitational sector (curvature and scalar field) and matter sector. In this paper, focusing on a simple power-law inflation model in the Einstein frame, two examples are considered; a super-inflationary and a bouncing universe Jordan frames. Then we consider a spectator curvaton minimally coupled to a Jordan frame, and compute its contribution to the curvature perturbation power spectrum. In these specific examples, we find a blue tilt at short scales for the super-inflationary case, and a blue tilt at large scales for the bouncing case.

  3. NSLS annual report 1984

    SciTech Connect (OSTI)

    Klaffky, R.; Thomlinson, W. (eds.)

    1984-01-01T23:59:59.000Z

    The first comprehensive Annual Report of the National Synchrotron Light Source comes at a time of great activity and forward motion for the facility. In the following pages we outline the management changes that have taken place in the past year, the progress that has been made in the commissioning of the x-ray ring and in the enhanced utilization of the uv ring, together with an extensive discussion of the interesting scientific experiments that have been carried out.

  4. Decreasing Utility Contract Interest through Annual Payments | Department

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny:Revised Finding of No53197 This workDayton: ENERGY8Decommissioning

  5. Inflatable tool with rib expansion support

    SciTech Connect (OSTI)

    Mody, R.K.

    1990-12-25T23:59:59.000Z

    This patent describes apparatus for introduction into a subterranean well on a conduit. It comprises a cylindrical housing including upper and lower collar members; means for securing the housing relative to the conduit; an inflatable elastomeric element disposed around the exterior of the housing; anchoring means; and elastically expandable belt means carried around the exterior of the anchoring means and spaced between the inflatable elastomeric element and each of the collars.

  6. Hill crossing during preheating after hilltop inflation

    E-Print Network [OSTI]

    Stefan Antusch; David Nolde; Stefano Orani

    2015-03-20T23:59:59.000Z

    In 'hilltop inflation', inflation takes place when the inflaton field slowly rolls from close to a maximum of its potential (i.e. the 'hilltop') towards its minimum. When the inflaton potential is associated with a phase transition, possible topological defects produced during this phase transition, such as domain walls, are efficiently diluted during inflation. It is typically assumed that they also do not reform after inflation, i.e. that the inflaton field stays on its side of the 'hill', finally performing damped oscillations around the minimum of the potential. In this paper we study the linear and the non-linear phases of preheating after hilltop inflation. We find that the fluctuations of the inflaton field during the tachyonic oscillation phase grow strong enough to allow the inflaton field to form regions in position space where it crosses 'over the top of the hill' towards the 'wrong vacuum'. We investigate the formation and behaviour of these overshooting regions using lattice simulations: Rather than durable domain walls, these regions form oscillon-like structures (i.e. localized bubbles that oscillate between the two vacua) which should be included in a careful study of preheating in hilltop inflation.

  7. Inflation from the Higgs field false vacuum with hybrid potential

    SciTech Connect (OSTI)

    Masina, Isabella [Dip. di Fisica, Università di Ferrara and INFN Sez. di Ferrara, Via Saragat 1, I-44100 Ferrara (Italy); Notari, Alessio, E-mail: masina@fe.infn.it, E-mail: notari@ffn.ub.es [Departament de Física Fondamental i Institut de Ciències del Cosmos, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona (Spain)

    2012-11-01T23:59:59.000Z

    We have recently suggested [1,2] that Inflation could have started in a local minimum of the Higgs potential at field values of about 10{sup 15}–10{sup 17} GeV, which exists for a narrow band of values of the top quark and Higgs masses and thus gives rise to a prediction on the Higgs mass to be in the range 123–129 GeV, together with a prediction on the the top mass and the cosmological tensor-to-scalar ratio r. Inflation can be achieved provided there is an additional degree of freedom which allows the transition to a radiation era. In [1] we had proposed such field to be a Brans-Dicke scalar. Here we present an alternative possibility with an additional subdominant scalar very weakly coupled to the Higgs, realizing an (inverted) hybrid Inflation scenario. Interestingly, we show that such model has an additional constraint m{sub H} < 125.3±3{sub th}, where 3{sub th} is the present theoretical uncertainty on the Standard Model RGEs. The tensor-to-scalar ratio has to be within the narrow range 10{sup ?4}?

  8. annual solar erythemal: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    as Estimated from Annual Tree Rings CERN Preprints Summary: The relationship between solar activity and the global climate is not only an academically interesting issue, but...

  9. Upgraded Coal Interest Group

    SciTech Connect (OSTI)

    Evan Hughes

    2009-01-08T23:59:59.000Z

    The Upgraded Coal Interest Group (UCIG) is an EPRI 'users group' that focuses on clean, low-cost options for coal-based power generation. The UCIG covers topics that involve (1) pre-combustion processes, (2) co-firing systems and fuels, and (3) reburn using coal-derived or biomass-derived fuels. The UCIG mission is to preserve and expand the economic use of coal for energy. By reducing the fuel costs and environmental impacts of coal-fired power generation, existing units become more cost effective and thus new units utilizing advanced combustion technologies are more likely to be coal-fired.

  10. DBI Galileon inflation in the light of Planck 2015

    E-Print Network [OSTI]

    Escamilla-Rivera, Celia; Sanchez, Juan C Bueno; Moniz, Paulo Vargas; Marto, Joao; .,

    2015-01-01T23:59:59.000Z

    In this paper we consider a DBI Galileon (DBIG) inflationary model where interesting solutions arise when we constrain its parameter space using Planck 2015 and BICEP2/Keck array and Planck (BKP) joint analysis. In particular, we perform a potential independent analysis by only using the background equations. We focus our attention on inflationary solutions characterized by a warp factor and a constant and varying speed of sound. Phenomenologically, we impose bounds on stringy aspects of the model such as warp factor $f$ and induced gravity parameter $\\tilde{m}$ using the current CMB bounds on spectral index $n_{s}$ and tensor to scalar ratio $r$. In all the cases, we consider the speed of sound restricted to the interval $c_{\\mathcal{D}}\\lesssim1$ in order to avoid large non-Gaussianities. Also, we compute quantities as the energy scale of inflation, mass of the inflaton and how these can change with different warped geometries. In this scenario we find inflation happens at GUT scale with tensor to scalar ra...

  11. Observational constraints on gauge field production in axion inflation

    SciTech Connect (OSTI)

    Meerburg, P.D. [Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08540 (United States); Pajer, E., E-mail: meerburg@princeton.edu, E-mail: enrico.pajer@gmail.com [Department of Physics, Princeton University, Princeton, NJ 08544 (United States)

    2013-02-01T23:59:59.000Z

    Models of axion inflation are particularly interesting since they provide a natural justification for the flatness of the potential over a super-Planckian distance, namely the approximate shift-symmetry of the inflaton. In addition, most of the observational consequences are directly related to this symmetry and hence are correlated. Large tensor modes can be accompanied by the observable effects of a the shift-symmetric coupling ?F F-tilde to a gauge field. During inflation this coupling leads to a copious production of gauge quanta and consequently a very distinct modification of the primordial curvature perturbations. In this work we compare these predictions with observations. We find that the leading constraint on the model comes from the CMB power spectrum when considering both WMAP 7-year and ACT data. The bispectrum generated by the non-Gaussian inverse-decay of the gauge field leads to a comparable but slightly weaker constraint. There is also a constraint from ?-distortion using TRIS plus COBE/FIRAS data, but it is much weaker. Finally we comment on a generalization of the model to massive gauge fields. When the mass is generated by some light Higgs field, observably large local non-Gaussianity can be produced.

  12. Holographic Inflation and the Low Entropy of the Early Universe

    E-Print Network [OSTI]

    Tom Banks

    2015-01-12T23:59:59.000Z

    This is a completely rewritten version of the talk I gave at the Philosophy of Cosmology conference in Tenerife, September 2014, which incorporates elements of my IFT Madrid Anthropics Conference talk. The original was too technical. The current version uses intuitive notions from black hole physics to explain the model of inflationary cosmology based on the Holographic Space Time formalism. The reason that the initial state of the universe had low entropy is that more generic states have no localized excitations, since in HST, localized excitations are defined by constraints on the fundamental variables. The only way to obtain a radiation dominated era, is for each time-like geodesic to see an almost uniform gas of small black holes as its horizon expands, such that the holes evaporate into radiation before they collide and coalesce. Comparing the time slicing that follows causal diamonds along a trajectory, with the global FRW slicing, one sees that systems outside the horizon had to undergo inflation, with a number of e-folds fixed by the present and inflationary cosmological constants, and the black hole number density on FRW slices just after inflation ends. These parameters also determine the size of scalar and tensor metric perturbations and the reheat temperature of the universe. I sketch a class of explicit finite quantum mechanical models of cosmology, which have these properties. Physicists interested in the details of those models should consult a recent paper\\cite{holoinflation3}.

  13. False Vacuum Inflation with Einstein Gravity

    E-Print Network [OSTI]

    Edmund J Copeland; Andrew R Liddle; David H Lyth; Ewan D Stewart; David Wands

    1994-01-10T23:59:59.000Z

    We investigate chaotic inflation models with two scalar fields, such that one field (the inflaton) rolls while the other is trapped in a false vacuum state. The false vacuum becomes unstable when the inflaton field falls below some critical value, and a first or second order transition to the true vacuum ensues. Particular attention is paid to Linde's second-order `Hybrid Inflation'; with the false vacuum dominating, inflation differs from the usual true vacuum case both in its cosmology and in its relation to particle physics. The spectral index of the adiabatic density perturbation can be very close to 1, or it can be around ten percent higher. The energy scale at the end of inflation can be anywhere between $10^{16}$\\,GeV and $10^{11}$\\,GeV, though reheating is prompt so the reheat temperature can't be far below $10^{11}\\,$GeV. Topological defects are almost inevitably produced at the end of inflation, and if the inflationary energy scale is near its upper limit they can have significant effects. Because false vacuum inflation occurs with the inflaton field far below the Planck scale, it is easier to implement in the context of supergravity than standard chaotic inflation. That the inflaton mass is small compared with the inflationary Hubble parameter is still a problem for generic supergravity theories, but remarkably this can be avoided in a natural way for a class of supergravity models which follow from orbifold compactification of superstrings. This opens up the prospect of a truly realistic, superstring

  14. Inflation targeting in emerging countries: the exchange rate issues

    E-Print Network [OSTI]

    Reyes Altamirano, Javier Arturo

    2004-09-30T23:59:59.000Z

    The current discussion of Inflation Targeting (IT) in emerging economies deals with the effects that nominal exchange rate movements have on the overall inflation rate. The literature has focused in the analysis of the advantages and disadvantages...

  15. Nonperturbative dynamics of reheating after inflation: A review

    E-Print Network [OSTI]

    Amin, Mustafa A.

    Our understanding of the state of the universe between the end of inflation and big bang nucleosynthesis (BBN) is incomplete. The dynamics at the end of inflation are rich and a potential source of observational signatures. ...

  16. Hill crossing during preheating after hilltop inflation

    E-Print Network [OSTI]

    Antusch, Stefan; Orani, Stefano

    2015-01-01T23:59:59.000Z

    In 'hilltop inflation', inflation takes place when the inflaton field slowly rolls from close to a maximum of its potential (i.e. the 'hilltop') towards its minimum. When the inflaton potential is associated with a phase transition, possible topological defects produced during this phase transition, such as domain walls, are efficiently diluted during inflation. It is typically assumed that they also do not reform after inflation, i.e. that the inflaton field stays on its side of the 'hill', finally performing damped oscillations around the minimum of the potential. In this paper we study the linear and the non-linear phases of preheating after hilltop inflation. We find that the fluctuations of the inflaton field during the tachyonic oscillation phase grow strong enough to allow the inflaton field to form regions in position space where it crosses 'over the top of the hill' towards the 'wrong vacuum'. We investigate the formation and behaviour of these overshooting regions using lattice simulations: Rather t...

  17. New models of chaotic inflation in supergravity

    SciTech Connect (OSTI)

    Kallosh, Renata; Linde, Andrei, E-mail: kallosh@stanford.edu, E-mail: alinde@stanford.edu [Department of Physics, Stanford University, Stanford, CA 94305 (United States)

    2010-11-01T23:59:59.000Z

    We introduce a new class of models of chaotic inflation inspired by the superconformal approach to supergravity. This class of models allows a functional freedom of choice of the inflaton potential V = |f(?)|{sup 2}. The simplest model of this type has a quadratic potential m{sup 2}?{sup 2}/2. Another model describes an inflaton field with the standard symmetry breaking potential ?{sup 2}(?{sup 2}?v{sup 2}){sup 2}. Depending on the value of v and on initial conditions for inflation, the spectral index n{sub s} may take any value from 0.97 to 0.93, and the tensor-to-scalar ratio r may span the interval form 0.3 to 0.01. A generalized version of this model has a potential ?{sup 2}(?{sup ?}?v{sup ?}){sup 2}. At large ? and ? > 0, this model describes chaotic inflation with the power law potential ? ?{sup 2?}. For ? < 0, this potential describes chaotic inflation with a potential which becomes flat in the large field limit. We further generalize these models by introducing a nonminimal coupling of the inflaton field to gravity. The mechanism of moduli stabilization used in these models allows to improve and generalize several previously considered models of chaotic inflation in supergravity.

  18. Observational constraints on braneworld chaotic inflation

    E-Print Network [OSTI]

    Andrew R Liddle; Anthony J Smith

    2003-08-13T23:59:59.000Z

    We examine observational constraints on chaotic inflation models in the Randall-Sundrum Type II braneworld. If inflation takes place in the high-energy regime, the perturbations produced by the quadratic potential are further from scale-invariance than in the standard cosmology, in the quartic case more or less unchanged, while for potentials of greater exponent the trend is reversed. We test these predictions against a data compilation including the WMAP measurements of microwave anisotropies and the 2dF galaxy power spectrum. While in the standard cosmology the quartic potential is at the border of what the data allow and all higher powers excluded, we find that in the high-energy regime of braneworld inflation even the quadratic case is under strong observational pressure. We also investigate the intermediate regime where the brane tension is comparable to the inflationary energy scale, where the deviations from scale-invariance prove to be greater.

  19. Inflation and Uplifting with Nilpotent Superfields

    E-Print Network [OSTI]

    Renata Kallosh; Andrei Linde

    2014-11-26T23:59:59.000Z

    Recently it was found that a broad class of existing inflationary models based on supergravity can be significantly simplified if some of the standard, unconstrained chiral superfields are replaced by nilpotent superfields, associated with Volkov-Akulov supersymmetry. The same method allows to simplify the existing models of uplifting of AdS vacua in string theory. In this paper we will show that one can go well beyond simplifying the models that already exist. We will propose a broad class of new models of chaotic inflation based on supergravity with nilpotent superfields, which simultaneously incorporate both inflation and uplifting. They provide a simple unified description of inflation and the present acceleration of the universe in the supergravity context.

  20. The Problem with False Vacuum Higgs Inflation

    E-Print Network [OSTI]

    Malcolm Fairbairn; Philipp Grothaus; Robert Hogan

    2014-03-28T23:59:59.000Z

    We investigate the possibility of using the only known fundamental scalar, the Higgs, as an inflaton with minimal coupling to gravity. The peculiar appearance of a plateau or a false vacuum in the renormalised effective scalar potential suggests that the Higgs might drive inflation. For the case of a false vacuum we use an additional singlet scalar field, motivated by the strong CP problem, and its coupling to the Higgs to lift the barrier allowing for a graceful exit from inflation by mimicking hybrid inflation. We find that this scenario is incompatible with current measurements of the Higgs mass and the QCD coupling constant and conclude that the Higgs can only be the inflaton in more complicated scenarios.

  1. Chaotic inflation in higher derivative gravity theories

    E-Print Network [OSTI]

    Myrzakul, Shynaray; Sebastiani, Lorenzo

    2015-01-01T23:59:59.000Z

    In this paper, we investigate chaotic inflation from scalar field subjected to potential in the framework of $f(R^2, P, Q)$-gravity, where we add a correction to Einstein's gravity based on a function of the square of the Ricci scalar $R^2$, the contraction of the Ricci tensor $P$, and the contraction of the Riemann tensor $Q$. The Gauss-Bonnet case is also discussed. We give the general formalism of inflation, deriving the slow-roll parameters, the $e$-folds number, and the spectral indexes. Several explicit examples are furnished, namely we will consider the cases of massive scalar field and scalar field with quartic potential and some power-law function of the curvature invariants under investigation in the gravitational action of the theory. Viable inflation according with observations is analyzed.

  2. International energy annual 1997

    SciTech Connect (OSTI)

    NONE

    1999-04-01T23:59:59.000Z

    The International Energy Annual presents an overview of key international energy trends for production, consumption, imports, and exports of primary energy commodities in over 220 countries, dependencies, and areas of special sovereignty. Also included are population and gross domestic product data, as well as prices for crude oil and petroleum products in selected countries. Renewable energy reported in the International Energy Annual includes hydroelectric power and geothermal, solar, and wind electric power. Also included are biomass electric power for Brazil and the US, and biomass, geothermal, and solar energy produced in the US and not used for electricity generation. This report is published to keep the public and other interested parties fully informed of primary energy supplies on a global basis. The data presented have been largely derived from published sources. The data have been converted to units of measurement and thermal values (Appendices E and F) familiar to the American public. 93 tabs.

  3. Generating Luminous and Dark Matter During Inflation

    E-Print Network [OSTI]

    Barrie, Neil D

    2015-01-01T23:59:59.000Z

    We propose a new mechanism for generating both luminous and dark matter during cosmic inflation. According to this mechanism, ordinary and dark matter carry common charge which is associated with an anomalous $ U(1)_{X} $ group. Anomaly terms source $ \\mathcal{CP} $ and $ U(1)_{X} $ charge violating processes during inflation, producing corresponding non-zero Chern-Simons numbers which are subsequently reprocessed into baryon and dark matter densities. The general framework developed is then applied to two possible extensions of the Standard Model with anomalous gauged $B$ and $B-L$, each with an additional dark matter candidate.

  4. Generating Luminous and Dark Matter During Inflation

    E-Print Network [OSTI]

    Neil D. Barrie; Archil Kobakhidze

    2015-03-09T23:59:59.000Z

    We propose a new mechanism for generating both luminous and dark matter during cosmic inflation. According to this mechanism, ordinary and dark matter carry common charge which is associated with an anomalous $ U(1)_{X} $ group. Anomaly terms source $ \\mathcal{CP} $ and $ U(1)_{X} $ charge violating processes during inflation, producing corresponding non-zero Chern-Simons numbers which are subsequently reprocessed into baryon and dark matter densities. The general framework developed is then applied to two possible extensions of the Standard Model with anomalous gauged $B$ and $B-L$, each with an additional dark matter candidate.

  5. Transplanckian energy production and slow roll inflation

    E-Print Network [OSTI]

    Ulf H. Danielsson

    2004-11-26T23:59:59.000Z

    In this paper we investigate how the energy density due to a non-standard choice of initial vacuum affects the expansion of the universe during inflation. To do this we introduce source terms in the Friedmann equations making sure that we respect the relation between gravity and thermodynamics. We find that the energy production automatically implies a slow rolling cosmological constant. Hence we also conclude that there is no well defined value for the cosmological constant in the presence of sources. We speculate that a non-standard vacuum can provide slow roll inflation on its own.

  6. Annual Reports

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office511041cloth DocumentationProductsAlternative FuelsSanta3 Table 3.EnergyAug412 Archive DataAnnualAnnual

  7. Issues in Complex Structure Moduli Inflation

    E-Print Network [OSTI]

    Hirotaka Hayashi; Ryo Matsuda; Taizan Watari

    2014-10-28T23:59:59.000Z

    Supersymmetric compactification with moderately large radius (${\\rm Re} \\sim {\\cal O}(10)$ or more) not only accommodates supersymmetric unification, but also provides candidates for an inflaton in the form of geometric moduli; the value of ${\\rm Re} > 1$ may be used as a parameter that brings corrections to the inflaton potential under control. Motivated by a bottom-up idea "right-handed sneutrino inflation" scenario, we study whether complex structure moduli can play some role during the slow-roll inflation and/or reheating process in this moderately large radius regime. Even when we allow a tuning introduced by Kallosh and Linde, the barrier of volume stabilization potential from gaugino condensation racetrack superpotential can hardly be as high as $(10^{16} \\; {\\rm GeV})^4$ for generic choice of parameters in this regime. It is also found that even very small deformation of complex structure during inflation/reheating distorts the volume stabilization potential, so that the volume stabilization imposes tight constraints on large-field inflation scenario involving evolution of complex structure moduli. A few ideas of satisfying those constraints in string theory are also discussed.

  8. Global-local duality in eternal inflation

    SciTech Connect (OSTI)

    Bousso, Raphael; Yang, I-S. [Center for Theoretical Physics, Department of Physics, University of California, Berkeley, California 94720-7300 (United States) and Lawrence Berkeley National Laboratory, Berkeley, California 94720-8162 (United States)

    2009-12-15T23:59:59.000Z

    We prove that the light-cone time cutoff on the multiverse defines the same probabilities as a causal patch with initial conditions in the longest-lived metastable vacuum. This establishes the equivalence of two measures of eternal inflation which naively appear very different (though both are motivated by holography). The duality can be traced to an underlying geometric relation which we identify.

  9. Multifield consequences for D-brane inflation

    SciTech Connect (OSTI)

    Dias, Mafalda; Frazer, Jonathan; Liddle, Andrew R., E-mail: m.dias@sussex.ac.uk, E-mail: j.frazer@sussex.ac.uk, E-mail: a.liddle@sussex.ac.uk [Astronomy Centre, University of Sussex, Brighton BN1 9QH (United Kingdom)

    2012-06-01T23:59:59.000Z

    We analyse the multifield behaviour in D-brane inflation when contributions from the bulk are taken into account. For this purpose, we study a large number of realisations of the potential; we find the nature of the inflationary trajectory to be very consistent despite the complex construction. Inflation is always canonical and occurs in the vicinity of an inflection point. Extending the transport method to non-slow-roll and to calculate the running, we obtain distributions for observables. The spectral index is typically blue and the running positive, putting the model under moderate pressure from WMAP7 constraints. The local f{sub NL} and tensor-to-scalar ratio are typically unobservably small, though we find approximately 0.5% of realisations to give observably large local f{sub NL}. Approximating the potential as sum-separable, we are able to give fully analytic explanations for the trends in observed behaviour. Finally we find the model suffers from the persistence of isocurvature perturbations, which can be expected to cause further evolution of adiabatic perturbations after inflation. We argue this is a typical problem for models of multifield inflation involving inflection points and renders models of this type technically unpredictive without a description of reheating.

  10. Annual Training Plan Template

    Broader source: Energy.gov [DOE]

    The Annual Training Plan Template is used by an organization's training POC to draft their organization's annual training plan.

  11. An ignoble approach to large field inflation

    SciTech Connect (OSTI)

    Kaloper, Nemanja [Department of Physics, University of California, Davis, CA 95616 (United States); Lawrence, Albion [Theory Group, Martin Fisher School of Physics, Brandeis University, MS057, PO Box 549110, Waltham, MA 02454 (United States); Sorbo, Lorenzo, E-mail: kaloper@physics.ucdavis.edu, E-mail: albion@brandeis.edu, E-mail: sorbo@physics.umass.edu [Department of Physics, University of Massachusetts, Amherst, MA 01003 (United States)

    2011-03-01T23:59:59.000Z

    We study an inflationary model developed by Kaloper and Sorbo, in which the inflaton is an axion with a sub-Planckian decay constant, whose potential is generated by mixing with a topological 4-form field strength. This gives a 4d construction of ''axion monodromy inflation{sup :} the axion winds many times over the course of inflation and draws energy from the 4-form. The classical theory is equivalent to chaotic inflation with a quadratic inflaton potential. Such models can produce ''high scale'' inflation driven by energy densities of the order of (10{sup 16}GeV){sup 4}, which produces primordial gravitational waves potentially accessible to CMB polarization experiments. We analyze the possible corrections to this scenario from the standpoint of 4d effective field theory, identifying the physics which potentially suppresses dangerous corrections to the slow-roll potential. This yields a constraint relation between the axion decay constant, the inflaton mass, and the 4-form charge. We show how these models can evade the fundamental constraints which typically make high-scale inflation difficult to realize. Specifically, the moduli coupling to the axion-four-form sector must have masses higher than the inflationary Hubble scale (?<10{sup 14}GeV). There are also constraints from states that become light due to multiple windings of the axion, as happens in explicit string theory constructions of this scenario. Further, such models generally have a quantum-mechanical ''tunneling mode'' in which the axion jumps between windings, which must be suppressed. Finally, we outline possible observational signatures.

  12. The effective field theory of inflation models with sharp features

    SciTech Connect (OSTI)

    Bartolo, Nicola; Cannone, Dario; Matarrese, Sabino, E-mail: nicola.bartolo@pd.infn.it, E-mail: dario.cannone@pd.infn.it, E-mail: sabino.matarrese@pd.infn.it [Dipartimento di Fisica e Astronomia ''G. Galilei'', Università degli Studi di Padova, via Marzolo 8, I-35131 Padova (Italy)

    2013-10-01T23:59:59.000Z

    We describe models of single-field inflation with small and sharp step features in the potential (and sound speed) of the inflaton field, in the context of the Effective Field Theory of Inflation. This approach allows us to study the effects of features in the power-spectrum and in the bispectrum of curvature perturbations, from a model-independent point of view, by parametrizing the features directly with modified ''slow-roll'' parameters. We can obtain a self-consistent power-spectrum, together with enhanced non-Gaussianity, which grows with a quantity ? that parametrizes the sharpness of the step. With this treatment it is straightforward to generalize and include features in other coefficients of the effective action of the inflaton field fluctuations. Our conclusion in this case is that, excluding extrinsic curvature terms, the only interesting effects at the level of the bispectrum could arise from features in the first slow-roll parameter ? or in the speed of sound c{sub s}. Finally, we derive an upper bound on the parameter ? from the consistency of the perturbative expansion of the action for inflaton perturbations. This constraint can be used for an estimation of the signal-to-noise ratio, to show that the observable which is most sensitive to features is the power-spectrum. This conclusion would change if we consider the contemporary presence of a feature and a speed of sound c{sub s} < 1, as, in such a case, contributions from an oscillating folded configuration can potentially make the bispectrum the leading observable for feature models.

  13. Quantization of Perturbations in an Inflating Elastic Solid

    E-Print Network [OSTI]

    Michael Sitwell; Kris Sigurdson

    2014-07-01T23:59:59.000Z

    A sufficiently rigid relativistic elastic solid can be stable for negative pressure values and thus is capable of driving a stage of accelerated expansion. If a relativistic elastic solid drove an inflationary stage in the early Universe, quantum mechanically excited perturbations would arise in the medium. We quantize the linear scalar and tensor perturbations and investigate the observational consequences of having such an inflationary period. We find that slowly varying sound speeds of the perturbations and a slowing varying equation of state of the solid can produce a slightly red-tilted scalar power spectrum that agrees with current observational data. Even in the absence of nonadiabatic pressures, perturbations evolve on superhorizon scales, due to the shear stresses within the solid. As such, the spectra of perturbations are in general sensitive to the details of the end of inflation and we characterize this dependence. Interestingly, we uncover here accelerating solutions for elastic solids with (1 + P/\\rho) significantly greater than 0 that nevertheless have nearly scale-invariant scalar and tensor spectra. Beyond theoretical interest, this may allow for the possibility of viable inflationary phenomenology relatively far from the de Sitter regime.

  14. Annual Reports | Department of Energy

    Energy Savers [EERE]

    2000 (pdf) Annual Report for 1999 (pdf) Annual Report for 1998 (pdf) Annual Report for 1997 (pdf) Annual Report for 1996 (pdf) Annual Report for 1995 (pdf) Annual Report for 1994...

  15. Career Interest | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    of oneself. As you begin to plan for your career, this Learning Module introduces five free career interest assessmentsurveys. To return back to the Leadership Development...

  16. Volume-weighted measure for eternal inflation

    SciTech Connect (OSTI)

    Winitzki, Sergei [Department of Physics, Ludwig-Maximilians University, Munich (Germany) and Yukawa Institute of Theoretical Physics, Kyoto University, Kyoto (Japan)

    2008-08-15T23:59:59.000Z

    I propose a new volume-weighted probability measure for cosmological 'multiverse' scenarios involving eternal inflation. The 'reheating-volume (RV) cutoff' calculates the distribution of observable quantities on a portion of the reheating hypersurface that is conditioned to be finite. The RV measure is gauge-invariant, does not suffer from the 'youngness paradox', and is independent of initial conditions at the beginning of inflation. In slow-roll inflationary models with a scalar inflaton, the RV-regulated probability distributions can be obtained by solving nonlinear diffusion equations. I discuss possible applications of the new measure to 'landscape' scenarios with bubble nucleation. As an illustration, I compute the predictions of the RV measure in a simple toy landscape.

  17. Perturbation spectrum in inflation with cutoff

    E-Print Network [OSTI]

    A. Kempf; J. C. Niemeyer

    2001-09-20T23:59:59.000Z

    It has been pointed out that the perturbation spectrum predicted by inflation may be sensitive to a natural ultraviolet cutoff, thus potentially providing an experimentally accessible window to aspects of Planck scale physics. A priori, a natural ultraviolet cutoff could take any form, but a fairly general classification of possible Planck scale cutoffs has been given. One of those categorized cutoffs, also appearing in various studies of quantum gravity and string theory, has recently been implemented into the standard inflationary scenario. Here, we continue this approach by investigating its effects on the predicted perturbation spectrum. We find that the size of the effect depends sensitively on the scale separation between cutoff and horizon during inflation.

  18. Large Non-Gaussianity in Axion Inflation

    SciTech Connect (OSTI)

    Barnaby, Neil; Peloso, Marco [School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 (United States)

    2011-05-06T23:59:59.000Z

    The inflationary paradigm has enjoyed phenomenological success; however, a compelling particle physics realization is still lacking. Axions are among the best-motivated inflaton candidates, since the flatness of their potential is naturally protected by a shift symmetry. We reconsider the cosmological perturbations in axion inflation, consistently accounting for the coupling to gauge fields c{phi}FF-tilde, which is generically present in these models. This coupling leads to production of gauge quanta, which provide a new source of inflaton fluctuations, {delta}{phi}. For c > or approx. 10{sup 2}M{sub p}{sup -1}, these dominate over the vacuum fluctuations, and non-Gaussianity exceeds the current observational bound. This regime is typical for concrete realizations that admit a UV completion; hence, large non-Gaussianity is easily obtained in minimal and natural realizations of inflation.

  19. Reheating predictions in single field inflation

    E-Print Network [OSTI]

    Cook, Jessica L; Easson, Damien A; Krauss, Lawrence M

    2015-01-01T23:59:59.000Z

    Reheating is a transition era after the end of inflation, during which the inflaton is converted into the particles that populate the Universe at later times. No direct cosmological observables are normally traceable to this period of reheating. Indirect bounds can however be derived. One possibility is to consider cosmological evolution for observable CMB scales from the time of Hubble crossing to the present time. Depending upon the model, the duration and final temperature after reheating, as well as its equation of state, are directly linked to inflationary observables. For single-field inflationary models and for reheating scenarios that may be approximated by a constant equation of state, it is straightforward to derive relations between the reheating duration (or final temperature), its equation of state parameter, and the scalar power spectrum amplitude and spectral index. As a result, one may employ current bounds on inflation to constrain the nature of reheating. Alternatively, it is possible to fur...

  20. Dark Energy, Inflation and Extra Dimensions

    E-Print Network [OSTI]

    Paul J. Steinhardt; Daniel Wesley

    2008-12-07T23:59:59.000Z

    We consider how accelerated expansion, whether due to inflation or dark energy, imposes strong constraints on fundamental theories obtained by compactification from higher dimensions. For theories that obey the null energy condition (NEC), we find that inflationary cosmology is impossible for a wide range of compactifications; and a dark energy phase consistent with observations is only possible if both Newton's gravitational constant and the dark energy equation-of-state vary with time. If the theory violates the NEC, inflation and dark energy are only possible if the NEC-violating elements are inhomogeneously distributed in thecompact dimensions and vary with time in precise synchrony with the matter and energy density in the non-compact dimensions. Although our proofs are derived assuming general relativity applies in both four and higher dimensions and certain forms of metrics, we argue that similar constraints must apply for more general compactifications.

  1. Inflation in no-scale supergravity

    E-Print Network [OSTI]

    Lahanas, A B

    2015-01-01T23:59:59.000Z

    $R+R^2$ Supergravity is known to be equivalent to standard Supergravity coupled to two chiral supermultiples with a no-scale K\\"ahler potential. Within this framework, that can accomodate vanishing vacuum energy and spontaneous supersymmetry breaking, we consider modifications of the associated superpotential and study the resulting models, which, viewed as generalizations of the Starobinsky model, for a range of the superpotential parameters, describe viable single-field slow-roll inflation.

  2. Is Cosmological Constant Needed in Higgs Inflation?

    E-Print Network [OSTI]

    Feng, Chao-Jun

    2014-01-01T23:59:59.000Z

    The detection of B-mode shows a very powerful constraint to theoretical inflation models through the measurement of the tensor-to-scalar ratio $r$. Higgs boson is the most likely candidate of the inflaton field. But usually, Higgs inflation models predict a small value of $r$, which is not quite consistent with the recent results from BICEP2. In this paper, we explored whether a cosmological constant energy component is needed to improve the situation. And we found the answer is yes. For the so-called Higgs chaotic inflation model with a quadratic potential, it predicts $r\\approx 0.2$, $n_s\\approx0.96$ with e-folds number $N\\approx 56$, which is large enough to overcome the problems such as the horizon problem in the Big Bang cosmology. The required energy scale of the cosmological constant is roughly $\\Lambda \\sim (10^{14} \\text{GeV})^2 $, which means a mechanism is still needed to solve the fine-tuning problem in the later time evolution of the universe, e.g. by introducing some dark energy component.

  3. Is Cosmological Constant Needed in Higgs Inflation?

    E-Print Network [OSTI]

    Chao-Jun Feng; Xin-Zhou Li

    2014-04-15T23:59:59.000Z

    The detection of B-mode shows a very powerful constraint to theoretical inflation models through the measurement of the tensor-to-scalar ratio $r$. Higgs boson is the most likely candidate of the inflaton field. But usually, Higgs inflation models predict a small value of $r$, which is not quite consistent with the recent results from BICEP2. In this paper, we explored whether a cosmological constant energy component is needed to improve the situation. And we found the answer is yes. For the so-called Higgs chaotic inflation model with a quadratic potential, it predicts $r\\approx 0.2$, $n_s\\approx0.96$ with e-folds number $N\\approx 56$, which is large enough to overcome the problems such as the horizon problem in the Big Bang cosmology. The required energy scale of the cosmological constant is roughly $\\Lambda \\sim (10^{14} \\text{GeV})^2 $, which means a mechanism is still needed to solve the fine-tuning problem in the later time evolution of the universe, e.g. by introducing some dark energy component.

  4. Constraining inflation with future galaxy redshift surveys

    SciTech Connect (OSTI)

    Huang, Zhiqi; Vernizzi, Filippo [CEA, Institut de Physique Théorique, 91191 Gif-sur-Yvette cédex (France); Verde, Licia, E-mail: zhiqi.huang@cea.fr, E-mail: liciaverde@icc.ub.edu, E-mail: filippo.vernizzi@cea.fr [Institute of Sciences of the Cosmos (ICCUB), University of Barcelona, Marti i Franques 1, Barcelona 08024 (Spain)

    2012-04-01T23:59:59.000Z

    With future galaxy surveys, a huge number of Fourier modes of the distribution of the large scale structures in the Universe will become available. These modes are complementary to those of the CMB and can be used to set constraints on models of the early universe, such as inflation. Using a MCMC analysis, we compare the power of the CMB with that of the combination of CMB and galaxy survey data, to constrain the power spectrum of primordial fluctuations generated during inflation. We base our analysis on the Planck satellite and a spectroscopic redshift survey with configuration parameters close to those of the Euclid mission as examples. We first consider models of slow-roll inflation, and show that the inclusion of large scale structure data improves the constraints by nearly halving the error bars on the scalar spectral index and its running. If we attempt to reconstruct the inflationary single-field potential, a similar conclusion can be reached on the parameters characterizing the potential. We then study models with features in the power spectrum. In particular, we consider ringing features produced by a break in the potential and oscillations such as in axion monodromy. Adding large scale structures improves the constraints on features by more than a factor of two. In axion monodromy we show that there are oscillations with small amplitude and frequency in momentum space that are undetected by CMB alone but can be measured by including galaxy surveys in the analysis.

  5. General Single Field Inflation with Large Positive Non-Gaussianity

    E-Print Network [OSTI]

    Miao Li; Tower Wang; Yi Wang

    2008-03-29T23:59:59.000Z

    Recent analysis of the WMAP three year data suggests $f_{NL}^{local}\\simeq86.8$ in the WMAP convention. It is necessary to make sure whether general single field inflation can produce a large positive $f_{NL}$ before turning to other scenarios. We give some examples to generate a large positive $f_{NL}^{equil}$ in general single field inflation. Our models are different from ghost inflation. Due to the appearance of non-conventional kinetic terms, $f_{NL}^{equil}\\gg1$ can be realized in single field inflation.

  6. Winding out of the Swamp: Evading the Weak Gravity Conjecture with F-term Winding Inflation?

    E-Print Network [OSTI]

    Hebecker, Arthur; Rompineve, Fabrizio; Witkowski, Lukas T

    2015-01-01T23:59:59.000Z

    We present a new model of large field inflation along a winding trajectory in the field space of two axionic fields, where the 'axions' originate from the complex structure moduli sector of a Calabi-Yau 3-fold at large complex structure. The winding trajectory arises from fixing one combination of axions by bulk fluxes and allows for a transplanckian effective field range. The inflaton potential arises from small 'instantonic' corrections to the geometry and realises natural inflation. By working in a regime of large complex structure for two complex structure moduli the inflaton potential can be made subdominant without severe tuning. We also discuss the impact of the recent 'no-go theorems' for transplanckian axion periodicities on our work. Interestingly, our setup seems to realise a loophole pointed out in arXiv:1503.04783: our construction is a candidate for a string theory model of large field inflation which is consistent with the mild form of the weak gravity conjecture for axions.

  7. Annual Report

    Energy Savers [EERE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directed off Energy.gov. Are you0 ARRA NewslettersPartnership of the Americas |AnchorageAnnaofAnnual

  8. Annual Report

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE: Alternative Fuels DataEnergyDepartment ofATVMAgriculturalAn1 Annual FOIA09 THROUGH 09/30/2010

  9. Annual Report

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011AT&T, Inc.'s Reply Comments AT&T,FACT SAmesEnergyAnnual Planning Summaries:1

  10. Annual Report

    Energy Savers [EERE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directed offOCHCO Overview OCHCOSystemsProgram OverviewAdvocate -AmirAnnual Report Fiscal Year 2011 Office of

  11. Interested Parties - Siemens | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    GCHarrisSiemens.PDF More Documents & Publications Interested Parties - Myriant Interested Parties - Patrick Murphy...

  12. The Late Time Behavior of False Vacuum Decay: Possible Implications for Cosmology and Metastable Inflating States

    E-Print Network [OSTI]

    Lawrence M. Krauss; James Dent

    2007-11-24T23:59:59.000Z

    We describe here how the late time behavior of the decaying states, which is predicted to deviate from an exponential form, while normally of insignificant consequence, may have important cosmological implications in the case of false vacuum decay. It may increase the likelihood of eternal inflation, and may help explain the likelihood of observing a small vacuum energy at late times, as well as arguing against decay into a large negative energy (anti-de Sitter space), vacuum state as has been motivated by some string theory considerations. Several interesting open questions are raised, including whether observing the cosmological configuration of a metastable universe can constrain its inferred lifetime.

  13. Gradient expansion of superhorizon perturbations in G-inflation

    SciTech Connect (OSTI)

    Frusciante, Noemi; Zhou, Shuang-Yong; Sotiriou, Thomas P., E-mail: nfruscia@sissa.it, E-mail: szhou@sissa.it, E-mail: sotiriou@sissa.it [SISSA and INFN Sezione di Trieste, Via Bonomea 265, 34136, Trieste (Italy)

    2013-07-01T23:59:59.000Z

    We develop the gradient expansion formalism for shift-symmetric Galileon-type actions. We focus on backgrounds that undergo inflation, work in the synchronous gauge, and obtain a general solution up to second order without imposing extra conditions at first order. The solution simplifies during the late stages of inflation. We also define a curvature perturbation conserved up to first order.

  14. Quasiattractor dynamics of lambda-phi^4-inflation

    E-Print Network [OSTI]

    V. V. Kiselev; S. A. Timofeev

    2008-06-11T23:59:59.000Z

    At high e-foldings of expansion, the inflation with the quartic potential exhibits the parametric attractor governed by the slowly running Hubble rate. This quasiattractor simplifies the analysis of predictions for the inhomogeneity generated by the quantum fluctuations of inflaton. The method reveals the connection of inflation e-folding with general parameters of preheating regime in various scenarios and observational data.

  15. Higgs inflation and suppression of axion isocurvature perturbation

    E-Print Network [OSTI]

    Nakayama, Kazunori

    2015-01-01T23:59:59.000Z

    We point out that cosmological constraint from the axion isocurvature perturbation is relaxed if the Higgs field obtains a large field value during inflation in the DFSZ axion model. This scenario is consistent with the Higgs inflation model, in which two Higgs doublets have non-minimal couplings and play a role of inflaton.

  16. Higgs inflation and suppression of axion isocurvature perturbation

    E-Print Network [OSTI]

    Kazunori Nakayama; Masahiro Takimoto

    2015-05-22T23:59:59.000Z

    We point out that cosmological constraint from the axion isocurvature perturbation is relaxed if the Higgs field obtains a large field value during inflation in the DFSZ axion model. This scenario is consistent with the Higgs inflation model, in which two Higgs doublets have non-minimal couplings and play a role of inflaton.

  17. Mutated hilltop inflation: a natural choice for early universe

    SciTech Connect (OSTI)

    Pal, Barun Kumar; Pal, Supratik; Basu, B., E-mail: barunp1985@rediffmail.com, E-mail: supratik@isical.ac.in, E-mail: banasri@isical.ac.in [Physics and Applied Mathematics Unit, Indian Statistical Institute, 203 B.T.Road, Kolkata 700 108 (India)

    2010-01-01T23:59:59.000Z

    We propose a model of inflation with a suitable potential for a single scalar field which falls in the wide class of hilltop inflation. We derive the analytical expressions for most of the physical quantities related to inflation and show that all of them represent the true behavior as required from a model of inflation. We further subject the results to observational verification by formulating the theory of perturbations based on our model followed by an estimation for the values of those observable parameters. Our model is found to be in excellent agreement with observational data. Thus, the features related to the model leads us to infer that this type of hilltop inflation may be a natural choice for explaining the early universe.

  18. Mutated Hilltop Inflation : A Natural Choice for Early Universe

    E-Print Network [OSTI]

    Barun Kumar Pal; Supratik Pal; B. Basu

    2010-01-27T23:59:59.000Z

    We propose a model of inflation with a suitable potential for a single scalar field which falls in the wide class of hilltop inflation. We derive the analytical expressions for most of the physical quantities related to inflation and show that all of them represent the true behavior as required from a model of inflation. We further subject the results to observational verification by formulating the theory of perturbations based on our model followed by an estimation for the values of those observable parameters. Our model is found to be in excellent agreement with observational data. Thus, the features related to the model leads us to infer that this type of hilltop inflation may be a natural choice for explaining the early universe.

  19. Challenges for Large-Field Inflation and Moduli Stabilization

    E-Print Network [OSTI]

    Wilfried Buchmuller; Emilian Dudas; Lucien Heurtier; Alexander Westphal; Clemens Wieck; Martin Wolfgang Winkler

    2015-02-06T23:59:59.000Z

    We analyze the interplay between K\\"ahler moduli stabilization and chaotic inflation in supergravity. While heavy moduli decouple from inflation in the supersymmetric limit, supersymmetry breaking generically introduces non-decoupling effects. These lead to inflation driven by a soft mass term, $m_\\varphi^2 \\sim m m_{3/2}$, where $m$ is a supersymmetric mass parameter. This scenario needs no stabilizer field, but the stability of moduli during inflation imposes a large supersymmetry breaking scale, $m_{3/2} \\gg H$, and a careful choice of initial conditions. This is illustrated in three prominent examples of moduli stabilization: KKLT stabilization, K\\"ahler Uplifting, and the Large Volume Scenario. Remarkably, all models have a universal effective inflaton potential which is flattened compared to quadratic inflation. Hence, they share universal predictions for the CMB observables, in particular a lower bound on the tensor-to-scalar ratio, $r \\gtrsim 0.05$.

  20. Measure problem for eternal and non-eternal inflation

    SciTech Connect (OSTI)

    Linde, Andrei; Noorbala, Mahdiyar, E-mail: alinde@stanford.edu, E-mail: noorbala@stanford.edu [Department of Physics, Stanford University, Stanford, CA 94305 (United States)

    2010-09-01T23:59:59.000Z

    We study various probability measures for eternal inflation by applying their regularization prescriptions to models where inflation is not eternal. For simplicity we work with a toy model describing inflation that can interpolate between eternal and non-eternal inflation by continuous variation of a parameter. We investigate whether the predictions of four different measures (proper time, scale factor cutoff, stationary and causal diamond) change continuously with the change of this parameter. We will show that only for the stationary measure the predictions change continuously. For the proper-time and the scale factor cutoff, the predictions are strongly discontinuous. For the causal diamond measure, the predictions are continuous only if the stage of the slow-roll inflation is sufficiently long.

  1. Matter inflation with A{sub 4} flavour symmetry breaking

    SciTech Connect (OSTI)

    Antusch, Stefan [Department of Physics, University of Basel, Klingelbergstrasse 82, Basel, CH-4056 Switzerland (Switzerland); Nolde, David, E-mail: stefan.antusch@unibas.ch, E-mail: david.nolde@unibas.ch [Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, München, D-80805 Germany (Germany)

    2013-10-01T23:59:59.000Z

    We discuss model building in tribrid inflation, which is a framework for realising inflation in the matter sector of supersymmetric particle physics models. The inflaton is a D-flat combination of matter fields, and inflation ends by a phase transition in which some Higgs field obtains a vacuum expectation value. We first describe the general procedure for implementing tribrid inflation in realistic models of particle physics that can be applied to a wide variety of BSM particle physics models around the GUT scale. We then demonstrate how the procedure works for an explicit lepton flavour model based on an A{sub 4} family symmetry. The model is both predictive and phenomenologically viable, and illustrates how tribrid inflation connects cosmological and particle physics parameters. In particular, it predicts a relation between the neutrino Yukawa coupling and the running of the spectral index ?{sub s}. We also show how topological defects from the flavour symmetry breaking can be avoided automatically.

  2. Natural inflation and moduli stabilization in heterotic orbifolds

    E-Print Network [OSTI]

    Ruehle, Fabian

    2015-01-01T23:59:59.000Z

    We study moduli stabilization in combination with inflation in heterotic orbifold compactifications in the light of a large Hubble scale and the favored tensor-to-scalar ratio $r \\approx 0.05$. To account for a trans-Planckian field range we implement aligned natural inflation. Although there is only one universal axion in heterotic constructions, further axions from the geometric moduli can be used for alignment and inflation. We argue that such an alignment is rather generic on orbifolds, since all non-perturbative terms are determined by modular weights of the involved fields and the Dedekind $\\eta$ function. We present two setups inspired by the mini-landscape models of the $\\mathbb Z_{6-\\text{II}}$ orbifold which realize aligned inflation and stabilization of the relevant moduli. One has a supersymmetric vacuum after inflation, while the other includes a gaugino condensate which breaks supersymmetry at a high scale.

  3. Power Suppression in D-Brane Inflation

    E-Print Network [OSTI]

    Akers, Christopher Nelson

    2013-10-01T23:59:59.000Z

    where we think it is. We check this by plotting as a function of N, and making sure that it is satisfied while the inflaton is on the left side of the flat region. 26 FIG. 16. We see that around . Afterwards, slow-roll inflation...) (2013), arXiv:1303.5076 [astro-ph.CO]. [6] P. A. R. Ade et al. [BICEP2 Collaboration], arXiv:1403.3985 [astro-ph.CO]. [7] Baumann et al., arXiv:0706.0360 [hep-th]. [8] Trodden et al., arXiv:astro-ph/0401547. [9] S. Dodelson, Modern Cosmology...

  4. Inflation in no-scale supergravity

    E-Print Network [OSTI]

    A. B. Lahanas; K. Tamvakis

    2015-03-15T23:59:59.000Z

    $R+R^2$ Supergravity is known to be equivalent to standard Supergravity coupled to two chiral supermultiples with a no-scale K\\"ahler potential. Within this framework, that can accomodate vanishing vacuum energy and spontaneous supersymmetry breaking, we consider modifications of the associated superpotential and study the resulting models, which, viewed as generalizations of the Starobinsky model, for a range of the superpotential parameters, describe viable single-field slow-roll inflation. In all models studied in this work the tensor to scalar ratio is found to be small, well below the upper bound established by the very recent PLANCK and BICEP2 data.

  5. Cosmology as Science?: From Inflation to Eternity

    ScienceCinema (OSTI)

    None

    2011-10-06T23:59:59.000Z

    The last decade or two have represented the golden age of observational cosmology, producing a revolution in our picture of the Universe on its largest scales, and perhaps also its smallest ones. I will argue that these recent development bring to the forefront some vexing questions about whether various fundamental assumptions about the universe are in fact falsifiable. I will focus on 3 issues: (1) "Proving" Inflation, (2) Dark Energy and Anthropic Arguments, and (3) Cosmology of the far future.Interview with Lawrence M. Krauss

  6. Probability of Slowroll Inflation in the Multiverse

    E-Print Network [OSTI]

    I-Sheng Yang

    2012-10-23T23:59:59.000Z

    Slowroll after tunneling is a crucial step in one popular framework of the multiverse---false vacuum eternal inflation (FVEI). In a landscape with a large number of fields, we provide a heuristic estimation for its probability. We find that the chance to slowroll is exponentially suppressed, where the exponent comes from the number of fields. However, the relative probability to have more e-foldings is only mildly suppressed as $N_e^{-\\alpha} $ with $\\alpha\\sim3$. Base on these two properties, we show that the FVEI picture is still self-consistent and may have a strong preference between different slowroll models.

  7. Primordial Magnetic Fields in False Vacuum Inflation

    E-Print Network [OSTI]

    A. C. Davis; K. Dimopoulos

    1996-10-25T23:59:59.000Z

    We show that, during false vacuum inflation, a primordial magnetic field can be created, sufficiently strong to seed the galactic dynamo and generate the observed galactic magnetic fields. Considering the inflaton dominated regime, our field is produced by the Higgs-field gradients, resulting from a grand unified phase transition. The evolution of the field is followed from its creation through to the epoch of structure formation, subject to the relevant constraints. We find that it is possible to create a magnetic field of sufficient magnitude, provided the phase transition occurs during the final 5 e-foldings of the inflationary period.

  8. ARM - Arctic Meetings of Interest

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItemResearchSOLICITATIONIMODI FICATION OFMaterialsAnnual Reports

  9. Interested Parties - Multiple Loan Applications per Developer...

    Energy Savers [EERE]

    Documents & Publications Interested Parties - Allowing Multiple Projects per Application for Section 1705 Loan Guarantees Interested Parties - K&L Group Interested Parties - Shipp...

  10. Communications from Interested Parties | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    September 14, 2010 Interested Parties - Xtreme Power September 3, 2010 Interested Parties - Smith Dawson & Andrews August 10, 2010 Interested Parties - MEMA previous 1 2 3 4 5 next...

  11. Interested Parties - NNSA | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    NNSA Interested Parties - NNSA 06-03-10NNSA.pdf More Documents & Publications Interested Parties - Myriant Interested Parties - NRG Energy...

  12. Interests Diffusion in Social Networks

    E-Print Network [OSTI]

    D'Agostino, Gregorio; De Nicola, Antonio; Tucci, Salvatore

    2015-01-01T23:59:59.000Z

    Understanding cultural phenomena on Social Networks (SNs) and exploiting the implicit knowledge about their members is attracting the interest of different research communities both from the academic and the business side. The community of complexity science is devoting significant efforts to define laws, models, and theories, which, based on acquired knowledge, are able to predict future observations (e.g. success of a product). In the mean time, the semantic web community aims at engineering a new generation of advanced services by defining constructs, models and methods, adding a semantic layer to SNs. In this context, a leapfrog is expected to come from a hybrid approach merging the disciplines above. Along this line, this work focuses on the propagation of individual interests in social networks. The proposed framework consists of the following main components: a method to gather information about the members of the social networks; methods to perform some semantic analysis of the Domain of Interest; a p...

  13. F-term Axion Monodromy Inflation

    E-Print Network [OSTI]

    Fernando Marchesano; Gary Shiu; Angel M. Uranga

    2014-10-09T23:59:59.000Z

    The continuous shift symmetry of axions is at the heart of several realizations of inflationary models. In particular, axion monodromy inflation aims at achieving super-Planckian field ranges for the inflaton in the context of string theory. Despite the elegant underlying principle, explicit models constructed hitherto are exceedingly complicated. We propose a new and better axion monodromy inflationary scenario, where the inflaton potential arises from an F-term. We present several scenarios, where the axion arises from the Kaluza-Klein compactification of higher dimensional gauge fields (or p-form potentials) in the presence of fluxes and/or torsion homology. The monodromy corresponds to a change in the background fluxes, and its F-term nature manifests in the existence of domain walls interpolating among flux configurations. Our scenario leads to diverse inflaton potentials, including linear large field behaviour, chaotic inflation, as well as potentials with even higher powers. They provide an elegant set of constructions with properties in the ballpark of the recent BICEP2 observational data on primordial gravitational waves.

  14. Planck 2015. XX. Constraints on inflation

    E-Print Network [OSTI]

    Ade, P A R; Arnaud, M; Arroja, F; Ashdown, M; Aumont, J; Baccigalupi, C; Ballardini, M; Banday, A J; Barreiro, R B; Bartolo, N; Battaner, E; Benabed, K; Benoit, A; Benoit-Levy, A; Bernard, J -P; Bersanelli, M; Bielewicz, P; Bonaldi, A; Bonavera, L; Bond, J R; Borrill, J; Bouchet, F R; Boulanger, F; Bucher, M; Burigana, C; Butler, R C; Calabrese, E; Cardoso, J -F; Catalano, A; Challinor, A; Chamballu, A; Chary, R -R; Chiang, H C; Christensen, P R; Church, S; Clements, D L; Colombi, S; Colombo, L P L; Combet, C; Contreras, D; Couchot, F; Coulais, A; Crill, B P; Curto, A; Cuttaia, F; Danese, L; Davies, R D; Davis, R J; de Bernardis, P; de Rosa, A; de Zotti, G; Delabrouille, J; Desert, F -X; Diego, J M; Dole, H; Donzelli, S; Dore, O; Douspis, M; Ducout, A; Dupac, X; Efstathiou, G; Elsner, F; Ensslin, T A; Eriksen, H K; Fergusson, J; Finelli, F; Forni, O; Frailis, M; Fraisse, A A; Franceschi, E; Frejsel, A; Frolov, A; Galeotta, S; Galli, S; Ganga, K; Gauthier, C; Giard, M; Giraud-Heraud, Y; Gjerlow, E; Gonzalez-Nuevo, J; Gorski, K M; Gratton, S; Gregorio, A; Gruppuso, A; Gudmundsson, J E; Hamann, J; Handley, W; Hansen, F K; Hanson, D; Harrison, D L; Henrot-Versille, S; Hernandez-Monteagudo, C; Herranz, D; Hildebrandt, S R; Hivon, E; Hobson, M; Holmes, W A; Hornstrup, A; Hovest, W; Huang, Z; Huffenberger, K M; Hurier, G; Jaffe, A H; Jaffe, T R; Jones, W C; Juvela, M; Keihanen, E; Keskitalo, R; Kim, J; Kisner, T S; Kneissl, R; Knoche, J; Kunz, M; Kurki-Suonio, H; Lagache, G; Lahteenmaki, A; Lamarre, J -M; Lasenby, A; Lattanzi, M; Lawrence, C R; Leonardi, R; Lesgourgues, J; Levrier, F; Lewis, A; Liguori, M; Lilje, P B; Linden-Vornle, M; Lopez-Caniego, M; Lubin, P M; Ma, Y -Z; Macias-Perez, J F; Maggio, G; Maino, D; Mandolesi, N; Mangilli, A; Martin, P G; Martinez-Gonzalez, E; Masi, S; Matarrese, S; Mazzotta, P; McGehee, P; Meinhold, P R; Melchiorri, A; Mendes, L; Mennella, A; Migliaccio, M; Mitra, S; Miville-Deschenes, M -A; Molinari, D; Moneti, A; Montier, L; Morgante, G; Mortlock, D; Moss, A; Munchmeyer, M; Munshi, D; Murphy, J A; Naselsky, P; Nati, F; Natoli, P; Netterfield, C B; Norgaard-Nielsen, H U; Noviello, F; Novikov, D; Novikov, I; Oxborrow, C A; Paci, F; Pagano, L; Pajot, F; Paladini, R; Pandolfi, S; Paoletti, D; Pasian, F; Patanchon, G; Pearson, T J; Peiris, H V; Perdereau, O; Perotto, L; Perrotta, F; Pettorino, V; Piacentini, F; Piat, M; Pierpaoli, E; Pietrobon, D; Plaszczynski, S; Pointecouteau, E; Polenta, G; Popa, L; Pratt, G W; Prezeau, G; Prunet, S; Puget, J -L; Rachen, J P; Reach, W T; Rebolo, R; Reinecke, M; Remazeilles, M; Renault, C; Renzi, A; Ristorcelli, I; Rocha, G; Rosset, C; Rossetti, M; Roudier, G; Rowan-Robinson, M; Rubino-Martin, J A; Rusholme, B; Sandri, M; Santos, D; Savelainen, M; Savini, G; Scott, D; Seiffert, M D; Shellard, E P S; Shiraishi, M; Spencer, L D; Stolyarov, V; Stompor, R; Sudiwala, R; Sunyaev, R; Sutton, D; Suur-Uski, A -S; Sygnet, J -F; Tauber, J A; Terenzi, L; Toffolatti, L; Tomasi, M; Tristram, M; Trombetti, T; Tucci, M; Tuovinen, J; Valenziano, L; Valiviita, J; Van Tent, B; Vielva, P; Villa, F; Wade, L A; Wandelt, B D; Wehus, I K; White, M; Yvon, D; Zacchei, A; Zibin, J P; Zonca, A

    2015-01-01T23:59:59.000Z

    We present the implications for cosmic inflation of the Planck measurements of the cosmic microwave background (CMB) anisotropies in both temperature and polarization based on the full Planck survey. The Planck full mission temperature data and a first release of polarization data on large angular scales measure the spectral index of curvature perturbations to be $n_\\mathrm{s} = 0.968 \\pm 0.006$ and tightly constrain its scale dependence to $d n_s/d \\ln k =-0.003 \\pm 0.007$ when combined with the Planck lensing likelihood. When the high-$\\ell$ polarization data is included, the results are consistent and uncertainties are reduced. The upper bound on the tensor-to-scalar ratio is $r_{0.002} < 0.11$ (95% CL), consistent with the B-mode polarization constraint $r< 0.12$ (95% CL) obtained from a joint BICEP2/Keck Array and Planck analysis. These results imply that $V(\\phi) \\propto \\phi^2$ and natural inflation are now disfavoured compared to models predicting a smaller tensor-to-scalar ratio, such as $R^2$ ...

  15. Axion inflation in type II string theory

    SciTech Connect (OSTI)

    Grimm, Thomas W. [Physikalisches Institut der Universitaet Bonn, Nussallee 12, 53115 Bonn (Germany) and Department of Physics, University of Wisconsin, Madison, WI 53706 (United States)

    2008-06-15T23:59:59.000Z

    Inflationary models driven by a large number of axion fields are discussed in the context of type IIB compactifications with N=1 supersymmetry. The inflatons arise as the scalar modes of the R-R two-forms evaluated on vanishing two-cycles in the compact geometry. The vanishing cycles are resolved by small two-volumes or NS-NS B fields which sit together with the inflatons in the same supermultiplets. String world sheets wrapping the vanishing cycles correct the metric of the R-R inflatons. They can help to generate kinetic terms close to the Planck scale and a mass hierarchy between the axions and their nonaxionic partners during inflation. At small string coupling, D-brane corrections are subleading in the metric of the R-R inflatons. However, an axion potential can be generated by D1 instantons or gaugino condensates on D5-branes. Models with a sufficiently large number of axions admit regions of chaotic inflation which can stretch over the whole axion field range for potentials from gaugino condensates. These models could allow for a possibly detectable amount of gravitational waves with tensor to scalar ratio as high as r<0.14.

  16. Inflation and deformation of conformal field theory

    SciTech Connect (OSTI)

    Garriga, Jaume; Urakawa, Yuko, E-mail: jaume.garriga@ub.edu, E-mail: yurakawa@ffn.ub.es [Departament de Física Fonamental i Institut de Ciències del Cosmos, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona (Spain)

    2013-07-01T23:59:59.000Z

    It has recently been suggested that a strongly coupled phase of inflation may be described holographically in terms of a weakly coupled quantum field theory (QFT). Here, we explore the possibility that the wave function of an inflationary universe may be given by the partition function of a boundary QFT. We consider the case when the field theory is a small deformation of a conformal field theory (CFT), by the addition of a relevant operator O, and calculate the primordial spectrum predicted in the corresponding holographic inflation scenario. Using the Ward-Takahashi identity associated with Weyl rescalings, we derive a simple relation between correlators of the curvature perturbation ? and correlators of the deformation operator O at the boundary. This is done without specifying the bulk theory of gravitation, so that the result would also apply to cases where the bulk dynamics is strongly coupled. We comment on the validity of the Suyama-Yamaguchi inequality, relating the bi-spectrum and tri-spectrum of the curvature perturbation.

  17. Dark Energy as the Remnant of Inflation

    E-Print Network [OSTI]

    H. M. Fried; Y. Gabellini

    2013-02-24T23:59:59.000Z

    A QED-based symmetry breaking/bootstrap mechanism, appearing at sufficiently small space-time distances, is suggested as an explanation for the vacuum energy that furnished the initial impulse for Inflation, and continues on, to the present day, to provide the "Dark Energy" which is apparently forcing our Universe apart. Very high frequency virtual vacuum currents are assumed to generate weak, effective electromagnetic fields, corresponding to the appearance of an effective 4-potential A_vac (x), which is itself equal to the vacuum expectation value of the operator A(x) in the presence of that A_vac (x). Lorentz invariance is manifest, as every observer would measure the same electric field in his or her own reference frame. Such an effective vacuum field would have no relevance to the motion of ordinary charged particules until particle energies on the order of 10^5 TeV are possible. The model is sufficiently constrained so that one parameter is needed to fit the vacuum energy densities and relevant times for the onset and end of Inflation, as well as those parameters of present day Dark Energy.

  18. 2008 Annual Report

    SciTech Connect (OSTI)

    none,

    2008-01-01T23:59:59.000Z

    This annual report includes: a brief overview of Western; FY 2008 operational highlights; and financial data.

  19. annual safar symposium: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Tongue of Green River Shale. There are some populations on private land, mostly on energy company land, including one on Shell property. Brian K.: CNAP is interested 489 Annual...

  20. Eighteenth Annual Transportation Research Conference May 12, 2007

    E-Print Network [OSTI]

    Minnesota, University of

    Eighteenth Annual Transportation Research Conference May 1­2, 2007 RiverCentre, St. Paul, Minnesota Call for Presentations The Center for Transportation Studies invites interested individuals and groups to submit abstracts for presentation at the Center's Eighteenth Annual Transportation Research Conference

  1. 20th Annual Transportation Research Conference May 1920, 2009

    E-Print Network [OSTI]

    Minnesota, University of

    20th Annual Transportation Research Conference May 19­20, 2009 Sheraton Hotel, Bloomington, Minnesota Call for Presentations The Center for Transportation Studies invites interested individuals and groups to submit abstracts for presentation at the Center's 20th Annual Transportation Research

  2. Research Interest of Dilip Sarkar

    E-Print Network [OSTI]

    Sarkar, Dilip

    anywhere anytime. While traveling on vehicle we connect to the Internet using one or more of theses is to develop a group of autonomous mobile agents each with its own set of wireless sensors. These mobile agents at UM have fueled my interest. My goal is to develop parallel algorithms for bioinformatics problems

  3. Interested Parties - Pittsburgh Green Innovators | Department...

    Broader source: Energy.gov (indexed) [DOE]

    Attachment to Registered Lobbyist Disclosure Form: R More Documents & Publications Interested Parties - Andrew Lundquist Interested Parties - National Governors Association...

  4. Warm inflation dynamics in the low temperature regime

    SciTech Connect (OSTI)

    Bastero-Gil, Mar [Departamento de Fisica Teorica y del Cosmos, Universidad de Granada, Granada-18071 (Spain); Berera, Arjun [School of Physics, University of Edinburgh, Edinburgh, EH9 3JZ (United Kingdom)

    2007-08-15T23:59:59.000Z

    Warm inflation scenarios are studied with the dissipative coefficient computed in the equilibrium approximation. Use is made of the analytical expressions available in the low temperature regime with focus on the possibility of achieving strong dissipation within this approximation. Two different types of models are examined: monomial or equivalently chaotic type potentials, and hybrid like models where the energy density during inflation is dominated by the false vacuum. In both cases dissipation is shown to typically increase during inflation and bring the system into the strong dissipative regime. Observational consequences are explored for the amplitude of the primordial spectrum and the spectral index, which translate into constraints on the number of fields mediating the dissipative mechanism, and the number of light degrees of freedom produced during inflation. This paper furthers the foundational development of warm inflation dynamics from first principles quantum field theory by calculating conservative lower bound estimates on dissipative effects during inflation using the well established thermal equilibrium approximation. This approximation does not completely represent the actual physical system and earlier work has shown relaxing both the equilibrium and low temperature constraints can substantially enlarge the warm inflation regime, but these improvements still need further theoretical development.

  5. Inflation with stable anisotropic hair: is it cosmologically viable?

    E-Print Network [OSTI]

    Sigbjørn Hervik; David F. Mota; Mikjel Thorsrud

    2011-12-21T23:59:59.000Z

    Recently an inflationary model with a vector field coupled to the inflaton was proposed and the phenomenology studied for the Bianchi type I spacetime. It was found that the model demonstrates a counter-example to the cosmic no-hair theorem since there exists a stable anisotropically inflationary fix-point. One of the great triumphs of inflation, however, is that it explains the observed flatness and isotropy of the universe today without requiring special initial conditions. Any acceptable model for inflation should thus explain these observations in a satisfactory way. To check whether the model meets this requirement, we introduce curvature to the background geometry and consider axisymmetric spacetimes of Bianchi type II,III and the Kantowski-Sachs metric. We show that the anisotropic Bianchi type I fix-point is an attractor for the entire family of such spacetimes. The model is predictive in the sense that the universe gets close to this fix-point after a few e-folds for a wide range of initial conditions. If inflation lasts for N e-folds, the curvature at the end of inflation is typically of order exp(-2N). The anisotropy in the expansion rate at the end of inflation, on the other hand, while being small on the one-percent level, is highly significant. We show that after the end of inflation there will be a period of isotropization lasting for about 2N/3 e-folds. After that the shear scales as the curvature and becomes dominant around N e-folds after the end of inflation. For plausible bounds on the reheat temperature the minimum number of e-folds during inflation, required for consistency with the isotropy of the supernova Ia data, lays in the interval (21,48). Thus the results obtained for our restricted class of spacetimes indicates that inflation with anisotropic hair is cosmologically viable.

  6. Spectral indices in Eddington-inspired Born-Infeld inflation

    E-Print Network [OSTI]

    Inyong Cho; Jinn-Ouk Gong

    2015-06-23T23:59:59.000Z

    We investigate the scalar and the tensor spectral indices of the quadratic inflation model in Eddington-inspired Born-Infeld (EiBI) gravity. We find the EiBI corrections to the spectral indices are of second and first order in the slow-roll approximation for the scalar and the tensor perturbations respectively. This is very promising since the quadratic inflation model in general relativity provides a very nice fit for the spectral indices. Together with the suppression of the tensor-to-scalar ratio EiBI inflation is well along with the observational data.

  7. Adiabatic regularisation of power spectra in $k$-inflation

    E-Print Network [OSTI]

    Alinea, Allan L; Nakanishi, Yukari; Naylor, Wade

    2015-01-01T23:59:59.000Z

    We look at the question posed by Parker {\\it et al.} about the effect of UV regularisation on the power spectrum for inflation. Focusing on the slow-roll $k$-inflation, we show that up to second order in the Hubble and sound flow parameters, the adiabatic regularisation of such model leads to no difference in the power spectrum apart from certain cases that violate near scale invariant power spectra. Furthermore, extending to non-minimal $k$-inflation, we establish the equivalence of the subtraction terms in the adiabatic regularisation of the power spectrum in Jordan and Einstein frames.

  8. The Measure for the Multiverse and the Probability for Inflation

    E-Print Network [OSTI]

    Miao Li; Yi Wang

    2007-04-09T23:59:59.000Z

    We investigate the measure problem in the framework of inflationary cosmology. The measure of the history space is constructed and applied to inflation models. Using this measure, it is shown that the probability for the generalized single field slow roll inflation to last for $N$ e-folds is suppressed by a factor $\\exp(-3N)$, and the probability for the generalized $n$-field slow roll inflation is suppressed by a much larger factor $\\exp(-3nN)$. Some non-inflationary models such as the cyclic model do not suffer from this difficulty.

  9. Statistical Anisotropies in Gravitational Waves in Solid Inflation

    E-Print Network [OSTI]

    Mohammad Akhshik; Razieh Emami; Hassan Firouzjahi; Yi Wang

    2014-05-16T23:59:59.000Z

    Solid inflation can support a long period of anisotropic inflation. We calculate the statistical anisotropies in the scalar and tensor power spectra and their cross-correlation in anisotropic solid inflation. The tensor-scalar cross-correlation can either be positive or negative, which impacts the statistical anisotropies of the TT and TB spectra in CMB map more significantly compared with the tensor self-correlation. The tensor power spectrum contains potentially comparable contributions from quadrupole and octopole angular patterns, which is different from the power spectra of scalar, the cross-correlation or the scalar bispectrum, where the quadrupole type statistical anisotropy dominates over octopole.

  10. Sneutrino inflation in supersymmetric B - L with inverse seesaw

    SciTech Connect (OSTI)

    Khalil, Shaaban; Sil, Arunansu [Centre for Theoretical Physics, Zewail City of Science and Technology, Sheikh Zayed, 12588, Giza (Egypt); Department of Mathematics, Faculty of Science, Ain Shams University, Cairo, 11566 (Egypt); Department of Physics, Indian Institute of Technology, Guwahati, Assam 781039 (India)

    2012-07-27T23:59:59.000Z

    We have shown that inflation in the supersymmetric B - L extension of the Standard Model can be realized where one of the associated right-handed sneutrinos can provide a non-trivial inflationary trajectory at tree level (hence breaking B - L during inflation). As soon as the inflation ends, the right-handed sneutrino falls into the supersymmetric vacuum, with a vanishing vacuum expectation value, so that B - L symmetry is restored. The B - L gauge symmetry will be radiatively broken at a TeV scale and light neutrino masses are generated through the inverse seesaw mechanism.

  11. Constraining hybrid inflation models with WMAP three-year results

    SciTech Connect (OSTI)

    Cardoso, Antonio [Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth, PO1 2EG (United Kingdom)

    2007-01-15T23:59:59.000Z

    We reconsider the original model of quadratic hybrid inflation in light of the WMAP three-year results and study the possibility of obtaining a spectral index of primordial density perturbations, n{sub s}, smaller than 1 from this model. The original hybrid inflation model naturally predicts n{sub s}{>=}1 in the false vacuum dominated regime but it is also possible to have n{sub s}<1 when the quadratic term dominates. We therefore investigate whether there is also an intermediate regime compatible with the latest constraints, where the scalar field value during the last 50 e-folds of inflation is less than the Planck scale.

  12. Adiabatic regularisation of power spectra in $k$-inflation

    E-Print Network [OSTI]

    Allan L. Alinea; Takahiro Kubota; Yukari Nakanishi; Wade Naylor

    2015-03-26T23:59:59.000Z

    We look at the question posed by Parker {\\it et al.} about the effect of UV regularisation on the power spectrum for inflation. Focusing on the slow-roll $k$-inflation, we show that up to second order in the Hubble and sound flow parameters, the adiabatic regularisation of such model leads to no difference in the power spectrum apart from certain cases that violate near scale invariant power spectra. Furthermore, extending to non-minimal $k$-inflation, we establish the equivalence of the subtraction terms in the adiabatic regularisation of the power spectrum in Jordan and Einstein frames.

  13. Earth Sciences Division. Annual report 1979

    SciTech Connect (OSTI)

    Not Available

    1980-07-01T23:59:59.000Z

    This annual report contains articles describing the research programs conducted during the year. Major areas of interest include geothermal exploration technology, geothermal energy conversion technology, reservoir engineering, geothermal environmental research, basic geosciences studies, applied geosciences studies, nuclear waste isolation, and marine sciences. (ACR)

  14. Electric power annual 1995. Volume I

    SciTech Connect (OSTI)

    NONE

    1996-07-01T23:59:59.000Z

    The Electric Power Annual presents a summary of electric power industry statistics at national, regional, and State levels. The objective of the publication is to provide industry decisionmakers, government policymakers, analysts, and the general public with data that may be used in understanding U.S. electricity markets. The Electric Power Annual is prepared by the Coal and Electric Data and Renewables Division; Office of Coal, Nuclear, Electric and Alternate Fuels; Energy Information Administration (EIA); U.S. Department of Energy. In the private sector, the majority of the users of the Electric Power Annual are researchers and analysts and, ultimately, individuals with policy- and decisionmaking responsibilities in electric utility companies. Financial and investment institutions, economic development organizations interested in new power plant construction, special interest groups, lobbyists, electric power associations, and the news media will find data in the Electric Power Annual useful. In the public sector, users include analysts, researchers, statisticians, and other professionals with regulatory, policy, and program responsibilities for Federal, State, and local governments. The Congress and other legislative bodies may also be interested in general trends related to electricity at State and national levels. Much of the data in these reports can be used in analytic studies to evaluate new legislation. Public service commissions and other special government groups share an interest in State-level statistics. These groups can also compare the statistics for their States with those of other jurisdictions.

  15. January 2013 Annual Role and Responsibility Survey

    E-Print Network [OSTI]

    entered into a Conflict of Interest Management Plan or who are otherwise required as a conditionJanuary 2013 Annual Role and Responsibility Survey The State of Colorado, the Board of Governors the institution? Yes No CEMML 1490 WCNR #12;January 2013 3. Supervision/Management of Employees: Do you have

  16. Evolution of Topological Defects During Inflation

    E-Print Network [OSTI]

    R. Basu; A. Vilenkin

    1994-02-22T23:59:59.000Z

    Topological defects can be formed during inflation by phase transitions as well as by quantum nucleation. We study the effect of the expansion of the Universe on the internal structure of the defects. We look for stationary solutions to the field equations, i.e. solutions that depend only on the proper distance from the defect core. In the case of very thin defects, whose core dimensions are much smaller than the de Sitter horizon, we find that the solutions are well approximated by the flat space solutions. However, as the flat space thickness parameter $\\delta_0$ increases we notice a deviation from this, an effect that becomes dramatic as $\\delta_0$ approaches $(H)^{-1}/{\\sqrt 2}$. Beyond this critical value we find no stationary solutions to the field equations. We conclude that only defects that have flat space thicknesses less than the critical value survive, while thicker defects are smeared out by the expansion.

  17. Kinetic Gravity Braiding and axion inflation

    E-Print Network [OSTI]

    Debaprasad Maity

    2013-03-11T23:59:59.000Z

    We constructed a new class of inflationary model with the higher derivative axion field which obeys constant shift symmetry. In the usual axion (natural) inflation, the axion decay constant is predicted to be in the super-Planckian regime which is believed to be incompatible with an effective field theory framework. With a novel mechanism originating from a higher derivative kinetic gravity braiding (KGB) of an axion field we found that there exist a huge parameter regime in our model where axion decay constant could be naturally sub-Planckian. Thanks to the KGB which effectively reduces the Planck constant. This effectively reduced Planck scale provides us the mechanism of further lowering down the speed of an axion field rolling down its potential without introducing super-Planckian axion decay constant. We also find that with that wide range of parameter values, our model induces almost scale invariant power spectrum as observed in CMB experiments.

  18. Axions, inflation and the anthropic principle

    SciTech Connect (OSTI)

    Mack, Katherine J., E-mail: mack@ast.cam.ac.uk [Kavli Institute for Cosmology, Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA (United Kingdom)

    2011-07-01T23:59:59.000Z

    The QCD axion is the leading solution to the strong-CP problem, a dark matter candidate, and a possible result of string theory compactifications. However, for axions produced before inflation, symmetry-breaking scales of f{sub a}?>10{sup 12} GeV (which are favored in string-theoretic axion models) are ruled out by cosmological constraints unless both the axion misalignment angle ?{sub 0} and the inflationary Hubble scale H{sub I} are extremely fine-tuned. We show that attempting to accommodate a high-f{sub a} axion in inflationary cosmology leads to a fine-tuning problem that is worse than the strong-CP problem the axion was originally invented to solve. We also show that this problem remains unresolved by anthropic selection arguments commonly applied to the high-f{sub a} axion scenario.

  19. Inflation, quintessence, and the origin of mass

    E-Print Network [OSTI]

    C. Wetterich

    2014-12-12T23:59:59.000Z

    In a unified picture both inflation and present dynamical dark energy arise from the same scalar field. The history of the Universe describes a crossover from a scale invariant "past fixed point" where all particles are massless, to a "future fixed point" for which spontaneous breaking of the exact scale symmetry generates the particle masses. The cosmological solution can be extrapolated to the infinite past in physical time - the universe has no beginning. This is seen most easily in a frame where particle masses and the Planck mass are field-dependent and increase with time. In this "freeze frame" the Universe shrinks and heats up during radiation and matter domination. In the equivalent, but singular Einstein frame cosmic history finds the familiar big bang description. The vicinity of the past fixed point corresponds to inflation. It ends at a first stage of the crossover. For the primordial fluctuations we find a spectral index $n\\lesssim 0.967$ and a tensor amplitude $r\\gtrsim 0.13$, with typical values close to the bounds. The crossover is completed by a second stage where the beyond-standard-model sector undergoes the transition to the future fixed point. The resulting increase of neutrino masses stops a cosmological scaling solution, relating the present dark energy density to the present neutrino mass. A simple model with no more free parameters than $\\Lambda$CDM is compatible with all present observational tests. We discuss how the fixed points are rooted within quantum gravity in a crossover between ultraviolet and infrared fixed points. Thus quantum properties of gravity can be tested both by very early and late cosmology.

  20. GUT-scale inflation with sizeable tensor modes

    E-Print Network [OSTI]

    Felix Brummer; Valerie Domcke; Veronica Sanz

    2014-09-16T23:59:59.000Z

    A sizeable tensor-to-scalar ratio, such as recently claimed by BICEP2, would imply a scale of inflation at the typical scale of supersymmetric grand unification. This could be an accident, or strong support for supersymmetric theories. Models of F-term hybrid inflation naturally connect the GUT scale with the inflationary scale, but they also predict the tensor-to-scalar ratio to be unmeasurably small. In this work we analyze a general UV embedding of F-term hybrid inflation into a supergravity theory with a general Kahler potential. The CMB observables are generated during the early phase of inflation, at large inflaton values, where the potential is dominated by Planck-suppressed operators. Tuning the leading higher-order terms can give an inflaton potential with sizeable tensor fluctuations and a field excursion which is still sub-Planckian but close to the Planck scale, as expected from the Lyth bound.

  1. Naturally inflating on steep potentials through electromagnetic dissipation

    SciTech Connect (OSTI)

    Anber, Mohamed M.; Sorbo, Lorenzo [Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003 (United States)

    2010-02-15T23:59:59.000Z

    In models of natural inflation, the inflaton is an axionlike particle. Unfortunately, axion potentials in UV-complete theories appear to be too steep to drive inflation. We show that, even for a steep potential, natural inflation can occur if the coupling between axion and gauge fields is taken into account. Because of this coupling, quanta of the gauge field are produced by the rolling of the axion. If the coupling is large enough, such a dissipative effect slows down the axion, leading to inflation even for a steep potential. The spectrum of perturbations is quasiscale invariant, but in the simplest construction its amplitude is larger than 10{sup -5}. We discuss a possible way out of this problem.

  2. Axion inflation and gravity waves in string theory

    SciTech Connect (OSTI)

    Kallosh, Renata; Sivanandam, Navin; Soroush, Masoud [Institute for Theoretical Physics, Department of Physics, Stanford University, Stanford, California 94305-4060 (United States)

    2008-02-15T23:59:59.000Z

    The majority of models of inflation in string theory predict an absence of measurable gravitational waves, r<<10{sup -3}. The most promising proposals for making string theoretic models that yield measurable tensor fluctuations involve axion fields with slightly broken shift symmetry. We consider such models in detail, with a particular focus on the N-flation scenario and on axion valley/natural inflation models. We find that in Calabi-Yau threefold compactifications with logarithmic Kaehler potentials K it appears to be difficult to meet the conditions required for axion inflation in the supergravity regime. However, in supergravities with an (approximately) quadratic shift-symmetric K, axion inflation may be viable. Such Kaehler potentials do arise in some string models, in specific limits of the moduli space. We describe the most promising classes of models; more detailed study will be required before one can conclude that working models exist.

  3. From SupernovaeFrom Supernovae to Inflationto Inflation

    E-Print Network [OSTI]

    Yamamoto, Hirosuke

    From SupernovaeFrom Supernovae to Inflationto Inflation Katsuhiko SatoKatsuhiko Sato 1)Department.4. NucleosynthesisNucleosynthesis in supernovaein supernovae II.II. ParticleParticle cosmologycosmology andand Early

  4. Confronting quasi-exponential inflation with WMAP seven

    E-Print Network [OSTI]

    Barun Kumar Pal; Supratik Pal; B. Basu

    2012-03-21T23:59:59.000Z

    We confront quasi-exponential models of inflation with WMAP seven years dataset using Hamilton Jacobi formalism. With a phenomenological Hubble parameter, representing quasi exponential inflation, we develop the formalism and subject the analysis to confrontation with WMAP seven using the publicly available code CAMB. The observable parameters are found to fair extremely well with WMAP seven. We also obtain a ratio of tensor to scalar amplitudes which may be detectable in PLANCK.

  5. Confronting quasi-exponential inflation with WMAP seven

    SciTech Connect (OSTI)

    Pal, Barun Kumar; Pal, Supratik; Basu, B., E-mail: barunp1985@rediffmail.com, E-mail: pal@th.physik.uni-bonn.de, E-mail: banasri@isical.ac.in [Physics and Applied Mathematics Unit, Indian Statistical Institute, 203 B.T. Road, Kolkata 700 108 (India)

    2012-04-01T23:59:59.000Z

    We confront quasi-exponential models of inflation with WMAP seven years dataset using Hamilton Jacobi formalism. With a phenomenological Hubble parameter, representing quasi exponential inflation, we develop the formalism and subject the analysis to confrontation with WMAP seven using the publicly available code CAMB. The observable parameters are found to fair extremely well with WMAP seven. We also obtain a ratio of tensor to scalar amplitudes which may be detectable in PLANCK.

  6. Warm inflation in the presence of magnetic fields

    E-Print Network [OSTI]

    Gabriella Piccinelli; Angel Sanchez; Alejandro Ayala; Ana Julia Mizher

    2014-09-08T23:59:59.000Z

    We study the effects of primordial magnetic fields on the inflationary potential in the context of a warm inflation scenario. The model, based on global supersymmetry with a new-inflation-type potential and a coupling between the inflaton and a heavy intermediate superfield, is already known to preserve the flatness required for slow-roll conditions even after including thermal contributions. Here we show that the magnetic field makes the potential even flatter, retarding the transition and rendering it smoother.

  7. Inflation beyond T-models and primordial B-modes

    E-Print Network [OSTI]

    Yi-Fu Cai; Jinn-Ouk Gong; Shi Pi

    2014-09-30T23:59:59.000Z

    We describe extended theories which shares the gauge transformation symmetry of the T-models, and takes the T-models as well as Starobinsky model as special cases. We derive a general relation between the two slow-roll parameters, and find that a large class of models can be embedded. Such models include more general Starobinsky-like inflation as well as the chaotic inflation with a large tensor-to-scalar ratio consistent with the BICEP2 result.

  8. Inflatable containment diaphragm for sealing and removing stacks

    DOE Patents [OSTI]

    Meskanick, G.R.; Rosso, D.T.

    1993-04-13T23:59:59.000Z

    A diaphragm with an inflatable torus-shaped perimeter is used to seal at least one end of a stack so that debris that might be hazardous will not be released during removal of the stack. A diaphragm is inserted and inflated in the lower portion of a stack just above where the stack is to be cut such that the perimeter of the diaphragm expands and forms a seal against the interior surface of the stack.

  9. How Well Can We Really Determine the Scale of Inflation?

    E-Print Network [OSTI]

    Ogan Özsoy; Kuver Sinha; Scott Watson

    2014-11-13T23:59:59.000Z

    A detection of primordial B-modes has been heralded not only as a smoking gun for the existence of inflation, but also as a way to establish the scale at which inflation took place. In this paper we critically reinvestigate the connection between a detection of primordial gravity waves and the scale of inflation. We consider whether the presence of additional fields and non-adiabaticity during inflation may have provided an additional source of primordial B-modes competitive with those of the quasi-de Sitter vacuum. In particular, we examine whether the additional sources could provide the dominant signal, which could lead to a misinterpretation of the scale of inflation. In light of constraints on the level of non-Gaussianity coming from Planck we find that only hidden sectors with strictly gravitationally strength couplings provide a feasible mechanism. The required model building is somewhat elaborate, and so we discuss possible UV completions in the context of Type IIB orientifold compactifications with RR axions. We find that an embedding is possible and that dangerous sinusoidal corrections can be suppressed through the compactification geometry. Our main result is that even when additional sources of primordial gravity waves are competitive with the inflaton, a positive B-mode detection would still be a relatively good indicator of the scale of inflation. This conclusion will be strengthened by future constraints on both non-Gaussianity and CMB polarization.

  10. How Likely are Constituent Quanta to Initiate Inflation?

    E-Print Network [OSTI]

    Berezhiani, Lasha

    2015-01-01T23:59:59.000Z

    We propose an intuitive framework for studying the problem of initial conditions in slow-roll inflation. In particular, we consider a universe at high, but sub-Planckian energy density and analyze the circumstances under which it is plausible for it to become dominated by inflated patches at late times, without appealing to the idea of self-reproduction. Our approach is based on defining a prior probability distribution for the constituent quanta of the pre-inflationary universe. To test the idea that inflation can begin under very generic circumstances, we make specific -- yet quite general and well grounded -- assumptions on the prior distribution. As a result, we are led to the conclusion that the probability for a given region to ignite inflation at sub-Planckian densities is extremely small. Furthermore, if one chooses to use the enormous volume factor that inflation yields as an appropriate measure, we find that the regions of the universe which started inflating at densities below the self-reproductive...

  11. 2011 ANNUAL SITE ENVIRONMENTAL REPORT

    SciTech Connect (OSTI)

    Meyer, A.; Eddy, T.; Jannik, T.; Terry, B.; Cauthen, K.; Coward, L.; Dunaway-Ackerman, J.; Wilson, M.; Hutchison, J.; O'Quinn, S.

    2012-10-01T23:59:59.000Z

    The Savannah River Site Environmental Report for 2011 (SRNS-STI-2012-00200) is prepared for the U.S. Department of Energy (DOE) according to requirements of DOE Order 231.1 B, “Environment, Safety and Health Reporting." The annual SRS Environmental Report has been produced for more than 50 years. Several hundred copies are and interested individuals. The report’s purpose is to: present summary environmental data that characterize site environmental management performance; describe compliance status with respect to environmental standards and requirements; highlight significant programs and efforts.

  12. Presentation at Innoventure Annual Competition

    SciTech Connect (OSTI)

    None

    2010-03-31T23:59:59.000Z

    This report documents the components of the workshop presented at the recent annual competition for the Innoventure program. The goal of the workshop was to focus on the delivery of science, technology, engineering, and math (STEM) concepts in a hands-on experiential learning format to increase interest in national security careers at NNSA, most of which are in the STEM fields. This work is a part of the National Security Preparedness Project (NSPP), being performed under a Department of Energy (DOE)/National Nuclear Security Administration (NNSA) grant.

  13. Modified natural inflation: A small single field model with a large tensor to scalar ratio

    E-Print Network [OSTI]

    Debaprasad Maity; Pankaj Saha

    2015-01-09T23:59:59.000Z

    In this paper we explored in detail a phenomenological model of modified single field natural inflation in light of recent cosmological experiments, BICEP2. Our main goal is to construct an inflationary model which not only predicts the important cosmological quantities such as $(n_s, r)$ compatible with experimental observation, but also is consistent with the low energy effective theory framework. Therefore, all the fundamental scale apart from $M_p$ and quantities of our interest should be within the sub-Planckian region. In order to achieve our goal we modify the usual single field natural inflationary model by a specific form of higher derivative kinetic term called kinetic gravity braiding (KGB). One of our guiding principles to construct such a model is the constant shift symmetry of the axion. We have chosen the form of the KGB term in such a way that it predicts the required value of $n_s\\simeq 0.96$ and a large tensor to scalar ratio $r> 0.1$. Importantly for a wide range of parameter space our model has sub-Planckian axion decay constant $f$ and the scale of inflation $\\Lambda$. However, the reheating after the end of inflation limits the value of $f$ so that we are unable to get $f$ to be significantly lower than $M_p$. Furthermore, we find sub-Planckian field excursion for the axion field $\\Delta \\phi \\simeq f$ for the sufficient number of e-folding ${\\cal N} \\gtrsim 50 $. We also discussed in detail about the natural preheating mechanism in our model based on the recently proposed Chern-Simon coupling. We found this gravity mediated preheating is very difficult to achieve in our model. With our general analytic argument, we also would like to emphasize that Chern-Simons mediated preheating is very unlikely to happen in any slow roll inflationary model.

  14. PRI Annual Report 2004

    E-Print Network [OSTI]

    Maynard-Moody, Steven

    2005-04-01T23:59:59.000Z

    research found within the pages of this annual report. To bring you closer to some of our research projects, the 2004 Annual Report focuses on three projects. Two teams of researchers are using innovative methods to examine important international issues...

  15. Annual Report 2001 Annual Report 2001

    E-Print Network [OSTI]

    Habib, Ayman

    The Arctic Institute of North America Annual Report 2001 The Arctic Institute of North America Annual Report 2001 #12;2000 Board of Directors · James Raffan,Seeley's Bay,Ontario (Chair until September 2001) · Murray B. Todd, Calgary,Alberta (Chair as of September 2001) · Luc Bouthillier,Québec City

  16. Library Annual Report Library Annual Report

    E-Print Network [OSTI]

    Tobar, Michael

    Library Annual Report 2007 Library Annual Report 2007 #12;www.library.uwa.edu.au Our mission: By delivering excellent information resources and services the Library is integral to the University's mission of advancing, transmitting and sustaining knowledge. Our vision: The Library will continue to be at the heart

  17. NASEO 2015 Annual Meeting

    Broader source: Energy.gov [DOE]

    The National Association of State Energy Officials (NASEO) Annual Meeting will be held in San Diego, California.

  18. 2011 -2012 Annual Report

    E-Print Network [OSTI]

    Yang, Zong-Liang

    2011 2012 Annual Report #12;2011 - 2012 Annual Report 2 INTRODUCING CAR SHARING Since the car share,116 Carpools 420 430 430 Car Share Members -- -- 661 #12;2011 - 2012 Annual Report 4 GARAGE PARKING INVENTORY or day, and gives the com- munity yet another reason to leave their cars at home. In its launch

  19. Communications from Interested Parties | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    - ARPA-E National Association of Manufacturers November 6, 2009 Interested Parties - Siemens October 29, 2009 Interested Parties - Multiple Loan Applications per Developer under...

  20. Leptogenesis during Axion Relaxation after Inflation

    E-Print Network [OSTI]

    Schmitz, Kai

    2015-01-01T23:59:59.000Z

    In this talk, I present a novel and minimal alternative to thermal leptogenesis, which builds upon the assumption that the electroweak gauge bosons are coupled to an axion-like scalar field, as it is, for instance, the case in certain string compactifications. The motion of this axion-like field after the end of inflation generates an effective chemical potential for leptons and antileptons, which, in the presence of lepton number-violating scatterings mediated by heavy Majorana neutrinos, provides an opportunity for baryogenesis via leptogenesis. In contrast to thermal leptogenesis, the final baryon asymmetry turns out to be insensitive to the masses and CP-violating phases in the heavy neutrino sector. Moreover, the proposed scenario requires a reheating temperature of at least O(10^12) GeV and it is, in particular, consistent with heavy neutrino masses close the scale of grand unification. This talk was given in February 2015 at HPNP 2015 at Toyama University and is based on recent work (arXiv:1412.2043 [h...

  1. Large Field Inflation from Axion Mixing

    E-Print Network [OSTI]

    Shiu, Gary; Ye, Fang

    2015-01-01T23:59:59.000Z

    We study the general multi-axion systems, focusing on the possibility of large field inflation driven by axions. We find that through axion mixing from a non-diagonal metric on the moduli space and/or from St\\"uckelberg coupling to a U(1) gauge field, an effectively super-Planckian decay constant can be generated without the need of "alignment" in the axion decay constants. We also investigate the consistency conditions related to the gauge symmetries in the multi-axion systems, such as vanishing gauge anomalies and the potential presence of generalized Chern-Simons terms. Our scenario applies generally to field theory models whose axion periodicities are intrinsically sub-Planckian, but it is most naturally realized in string theory. The types of axion mixings invoked in our scenario appear quite commonly in D-brane models, and we present its implementation in type II superstring theory. Explicit stringy models exhibiting all the characteristics of our ideas are constructed within the frameworks of Type IIA ...

  2. Holographic Theories of Inflation and Fluctuations

    E-Print Network [OSTI]

    Tom Banks; Willy Fischler

    2011-12-06T23:59:59.000Z

    The theory of holographic space-time (HST) generalizes both string theory and quantum field theory. It provides a geometric rationale for supersymmetry (SUSY) and a formalism in which super-Poincare invariance follows from Poincare invariance. HST unifies particles and black holes, realizing both as excitations of non-commutative geometrical variables on a holographic screen. Compact extra dimensions are interpreted as finite dimensional unitary representations of super- algebras, and have no moduli. Full field theoretic Fock spaces, and continuous moduli are both emergent phenomena of super-Poincare invariant limits in which the number of holographic degrees of freedom goes to infinity. Finite radius de Sitter (dS) spaces have no moduli, and break SUSY with a gravitino mass scaling like $\\Lambda^{1/4}$. We present a holographic theory of inflation and fluctuations. The inflaton field is an emergent concept, describing the geometry of an underlying HST model, rather than "a field associated with a microscopic string theory". We argue that the phrase in quotes is meaningless in the HST formalism.

  3. BILLS IMPORTANT TO THOSE INTERESTED IN GLOBAL WARMING League of Women Voters, Washington

    E-Print Network [OSTI]

    BILLS IMPORTANT TO THOSE INTERESTED IN GLOBAL WARMING League of Women Voters, Washington Current.85% annually by 2010) and renewable energy (15% by 2023) standards for Washington electric utilities, increase in local tax revenues, additional income for farmers with the added benefits of stable electricity

  4. Dynamically broken Supergravity, Starobinsky-type inflation and running vacuum: towards a fundamental cosmic picture

    E-Print Network [OSTI]

    Basilakos, Spyros; Sola, Joan

    2015-01-01T23:59:59.000Z

    We describe the primeval inflationary phase of the early Universe within a quantum field theoretical (QFT) framework that can be viewed as the effective action of vacuum decay in the early times. Interestingly enough, the model accounts for the "graceful exit" of the inflationary phase into the standard radiation regime. The underlying QFT framework considered here is Supergravity (SUGRA), more specifically an existing formulation in which the Starobinsky-type inflation (de-Sitter background) emerges from the quantum corrections to the effective action after integrating out the gravitino fields in their (dynamically induced) massive phase. We also demonstrate that the structure of the effective action in this model is consistent with the generic idea of renormalization group (RG) running of the cosmological parameters, specifically it follows from the corresponding RG equation for the vacuum energy density as a function of the Hubble rate, $\\rho_{\\Lambda}(H)$. Overall our combined approach amounts to a concre...

  5. The physics of business cycles and inflation Hans G. Danielmeyer and Thomas Martinetz

    E-Print Network [OSTI]

    consecutive cycles observed in the USA for employment and inflation. They are driven by three oil price shocks of the inflation rate are due to 3 crude oil price shocks. Natural damping prohibits cycles (dashed envelope lines show the increase of inflation due to the crude oil price shocks of the Jan Kippur Embargo

  6. Breathing costs, lifejacket inflation and parachute harnesses

    E-Print Network [OSTI]

    Jordan, Raymond Alan

    1974-01-01T23:59:59.000Z

    parachute harness, Army Air Force Material Command Report 49-696-7G, 1944 D 1 d'* 111 t t ! M&1 1 ~Dt tl 24th W Phil d lph' W. B Saunders, 1965. Frost, R H. Escape from high speed aircraft Paper presented at the 23rd annual meeting of the Institute... Phil d lphi: J. 9 Lippincott, 1963. Guyton, A C Textbook of Nedical ~Ph siol~. Philadelphia: W B Saunders, 1971. K p ' h . . 4 1 1 g 'l, E. ~ph d. 1 f M 1 ~Att 't Philadelphia: W. 8 Saunders, 1971 Kemp, C Self righting properties of aircrew life...

  7. Low-l CMB Power Loss in String Inflation

    E-Print Network [OSTI]

    Francisco G. Pedro; Alexander Westphal

    2013-09-13T23:59:59.000Z

    The lack of power on large scales (l < 40) might have been observed by the PLANCK satellite. We argue that this putative feature can be explained by a phase of fast roll at the onset of inflation. We show that in the context of single field models what is required is an asymmetric inflection point model of which fibre inflation is a string motivated example. We study the ability of fibre inflation to generate a suppression of the CMB 2-point function power at low l, finding that the potential derived from string loops is not steep enough for this purpose. We introduce a steeper contribution to the potential, that dominates away from the inflationary region, and show that if properly tuned it can indeed lead to a spectrum with lack of power at large scales.

  8. Reheating-volume measure for random-walk inflation

    SciTech Connect (OSTI)

    Winitzki, Sergei [Department of Physics, Ludwig-Maximilians University, Munich (Germany); Yukawa Institute of Theoretical Physics, Kyoto University, Kyoto (Japan)

    2008-09-15T23:59:59.000Z

    The recently proposed 'reheating-volume' (RV) measure promises to solve the long-standing problem of extracting probabilistic predictions from cosmological multiverse scenarios involving eternal inflation. I give a detailed description of the new measure and its applications to generic models of eternal inflation of random-walk type. For those models I derive a general formula for RV-regulated probability distributions that is suitable for numerical computations. I show that the results of the RV cutoff in random-walk type models are always gauge invariant and independent of the initial conditions at the beginning of inflation. In a toy model where equal-time cutoffs lead to the 'youngness paradox', the RV cutoff yields unbiased results that are distinct from previously proposed measures.

  9. Volume modulus inflation and the gravitino mass problem

    SciTech Connect (OSTI)

    Conlon, J P [Cavendish Laboratory, J J Thomson Avenue, Cambridge CB3 0HE (United Kingdom)] [Cavendish Laboratory, J J Thomson Avenue, Cambridge CB3 0HE (United Kingdom); Kallosh, R; Linde, A [Department of Physics, Stanford University, Stanford, CA 94305 (United States)] [Department of Physics, Stanford University, Stanford, CA 94305 (United States); Quevedo, F, E-mail: jpc41@cam.ac.uk, E-mail: kallosh@stanford.edu, E-mail: alinde@stanford.edu, E-mail: f.quevedo@damtp.cam.ac.uk [DAMTP, Centre for Mathematical Sciences, Wilberforce Road, Cambridge CB3 0WA (United Kingdom)] [DAMTP, Centre for Mathematical Sciences, Wilberforce Road, Cambridge CB3 0WA (United Kingdom)

    2008-09-15T23:59:59.000Z

    The Hubble constant during the last stages of inflation in a broad class of models based on the Kachru-Kallosh-Linde-Trivedi mechanism should be smaller than the gravitino mass, H{approx}inflation may occur exponentially far away from the present vacuum state. In these models, the Hubble constant during inflation can be many orders of magnitude greater than the gravitino mass. We introduce a toy model describing this scenario, and discuss its strengths and weaknesses.

  10. Eternal inflation, bubble collisions, and the persistence of memory

    SciTech Connect (OSTI)

    Garriga, Jaume; Guth, Alan H.; Vilenkin, Alexander [Departament de Fisica Fonamental, Universitat de Barcelona, Marti i Franques 1, 08028 Barcelona (Spain); Center for Theoretical Physics, Laboratory for Nuclear Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Institute of Cosmology, Department of Physics and Astronomy Tufts University, Medford, Massachusetts 02155 (United States)

    2007-12-15T23:59:59.000Z

    A 'bubble universe' nucleating in an eternally inflating false vacuum will experience, in the course of its expansion, collisions with an infinite number of other bubbles. In an idealized model, we calculate the rate of collisions around an observer inside a given reference bubble. We show that the collision rate violates both the homogeneity and the isotropy of the bubble universe. Each bubble has a center which can be related to 'the beginning of inflation' in the parent false vacuum, and any observer not at the center will see an anisotropic bubble collision rate that peaks in the outward direction. Surprisingly, this memory of the onset of inflation persists no matter how much time elapses before the nucleation of the reference bubble.

  11. Generalized Uncertainty Principle and Recent Cosmic Inflation Observations

    E-Print Network [OSTI]

    Abdel Nasser Tawfik; Abdel Magied Diab

    2014-10-29T23:59:59.000Z

    The recent background imaging of cosmic extragalactic polarization (BICEP2) observations are believed as an evidence for the cosmic inflation. BICEP2 provided a first direct evidence for the inflation, determined its energy scale and debriefed witnesses for the quantum gravitational processes. The ratio of scalar-to-tensor fluctuations $r$ which is the canonical measurement of the gravitational waves, was estimated as $r=0.2_{-0.05}^{+0.07}$. Apparently, this value agrees well with the upper bound value corresponding to PLANCK $r\\leq 0.012$ and to WMAP9 experiment $r=0.2$. It is believed that the existence of a minimal length is one of the greatest predictions leading to modifications in the Heisenberg uncertainty principle or a GUP at the Planck scale. In the present work, we investigate the possibility of interpreting recent BICEP2 observations through quantum gravity or GUP. We estimate the slow-roll parameters, the tensorial and the scalar density fluctuations which are characterized by the scalar field $\\phi$. Taking into account the background (matter and radiation) energy density, $\\phi$ is assumed to interact with the gravity and with itself. We first review the Friedmann-Lemaitre-Robertson-Walker (FLRW) Universe and then suggest modification in the Friedmann equation due to GUP. By using a single potential for a chaotic inflation model, various inflationary parameters are estimated and compared with the PLANCK and BICEP2 observations. While GUP is conjectured to break down the expansion of the early Universe (Hubble parameter and scale factor), two inflation potentials based on certain minimal supersymmetric extension of the standard model result in $r$ and spectral index matching well with the observations. Corresponding to BICEP2 observations, our estimation for $r$ depends on the inflation potential and the scalar field. A power-law inflation potential does not.

  12. Can Higgs Inflation be Saved with High-scale Supersymmetry ?

    E-Print Network [OSTI]

    Zheng, Sibo

    2015-01-01T23:59:59.000Z

    It is shown whether Higgs inflation can be saved with high-scale supersymmetry critically depends on the magnitude of non-minimal coupling constant $\\xi$. For small $\\xi \\leq 500$, the threshold correction at scale $M_{P}/\\xi$ is constrained in high precision.Its magnitude is in the narrow range of $(-0.03, -0.02)$ and $(-0.05, -0.04)$ for the wino and higgsino/singlino dark matter, respectively. While in the large $\\xi$-region with $\\xi \\geq 10^{4}$, such high-scale supersymmetry is excluded by too large threshold correction as required by Higgs inflation.

  13. Nontrivial Dynamics in the Early Stages of Inflation

    E-Print Network [OSTI]

    E. Calzetta; C. El Hasi

    1994-08-05T23:59:59.000Z

    Inflationary cosmologies, regarded as dynamical systems, have rather simple asymptotic behavior, insofar as the cosmic baldness principle holds. Nevertheless, in the early stages of an inflationary process, the dynamical behavior may be very complex. In this paper, we show how even a simple inflationary scenario, based on Linde's ``chaotic inflation'' proposal, manifests nontrivial dynamical effects such as the breakup of invariant tori, formation of cantori and Arnol'd's diffusion. The relevance of such effects is highlighted by the fact that even the occurrence or not of inflation in a given Universe is dependent upon them.

  14. Punctuated eternal inflation via AdS/CFT duality

    SciTech Connect (OSTI)

    Lowe, David A. [Department of Physics, Brown University, Providence, Rhode Island 02912 (United States); Roy, Shubho [Department of Physics, Brown University, Providence, Rhode Island 02912 (United States); Physics Department, City College of the CUNY, New York, New York 10031 (United States); Department of Physics and Astronomy, Lehman College of the CUNY, Bronx, New York 10468 (United States)

    2010-09-15T23:59:59.000Z

    The work is an attempt to model a scenario of inflation in the framework of anti-de Sitter/conformal field theory duality, a potentially complete nonperturbative description of quantum gravity. We study bubble geometries with de Sitter interiors within an ambient Schwarzschild anti-de Sitter black hole spacetime and the properties of the corresponding states in the dual conformal field theory. It is argued the viable bubble states can be identified with a subset of the black hole microstates. Consistency checks are performed and a number of implications regarding cosmology are discussed including how the key problems or paradoxes of conventional eternal inflation are overcome in this scenario.

  15. Can Higgs Inflation be Saved with High-scale Supersymmetry ?

    E-Print Network [OSTI]

    Sibo Zheng

    2015-04-30T23:59:59.000Z

    It is shown whether Higgs inflation can be saved with high-scale supersymmetry critically depends on the magnitude of non-minimal coupling constant $\\xi$. For small $\\xi \\leq 500$, the threshold correction at scale $M_{P}/\\xi$ is constrained in high precision.Its magnitude is in the narrow range of $(-0.03, -0.02)$ and $(-0.05, -0.04)$ for the wino and higgsino/singlino dark matter, respectively. While in the large $\\xi$-region with $\\xi \\geq 10^{4}$, such high-scale supersymmetry is excluded by too large threshold correction as required by Higgs inflation.

  16. EMSL 2009 Annual Report

    SciTech Connect (OSTI)

    Showalter, Mary Ann; Kathmann, Loel E.; Manke, Kristin L.; Wiley, Julie G.; Reed, Jennifer R.

    2010-02-26T23:59:59.000Z

    The EMSL 2009 Annual Report describes the science conducted at EMSL during 2009 as well as outreach activities and awards and honors received by users and staff.

  17. Historical Natural Gas Annual

    U.S. Energy Information Administration (EIA) Indexed Site

    Annual . 1996 Published October 1997 1997 Published October 1998 1998 Published October 1999 1999 Published October 2000 2000 Published December 2001...

  18. Annual Energy Outlook 2012

    Gasoline and Diesel Fuel Update (EIA)

    Administration Annual Energy Outlook 2012 17 Table A7. Transportation sector key indicators and delivered energy consumption (continued) Key indicators and consumption...

  19. Annual Energy Outlook 2012

    Gasoline and Diesel Fuel Update (EIA)

    3 U.S. Energy Information Administration | Annual Energy Outlook 2012 Reference case Table A6. Industrial sector key indicators and consumption Energy Information Administration ...

  20. Annual Energy Outlook 2012

    Gasoline and Diesel Fuel Update (EIA)

    36 Reference case Energy Information Administration Annual Energy Outlook 2012 6 Table A3. Energy prices by sector and source (2010 dollars per million Btu, unless otherwise...

  1. Annual Energy Outlook 2012

    Gasoline and Diesel Fuel Update (EIA)

    1 U.S. Energy Information Administration | Annual Energy Outlook 2012 Reference case Table A5. Commercial sector key indicators and consumption (quadrillion Btu per year, unless...

  2. Annual Energy Outlook 2012

    Gasoline and Diesel Fuel Update (EIA)

    9 U.S. Energy Information Administration | Annual Energy Outlook 2012 Table G1. Heat rates Fuel Units Approximate heat content Coal 1 Production . . . . . . . . . . . . . . . . . ....

  3. Annual Energy Outlook 2012

    Gasoline and Diesel Fuel Update (EIA)

    for Defense Districts 216 U.S. Energy Information Administration Annual Energy Outlook 2010 Figure F3. Petroleum Administration for Defense Districts AK WA NV AZ OR...

  4. Annual Energy Outlook 2012

    Gasoline and Diesel Fuel Update (EIA)

    end of table. (continued on next page) U.S. Energy Information Administration | Annual Energy Outlook 2012 116 Comparison with other projections Table 28. Comparison of coal...

  5. Required Annual Notices

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Required Annual Notices The Women's Health and Cancer Rights Act of 1998 (WHCRA) The medical programs sponsored by LANS will not restrict benefits if you or your dependent...

  6. Required Annual Notices

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Annual Notices The Women's Health and Cancer Rights Act of 1998 (WHCRA) The medical programs sponsored by LANS will not restrict benefits if you or your dependent receives...

  7. OPSI Annual Meeting

    Broader source: Energy.gov [DOE]

    The Organization of PJM States, Inc. (OPSI) is hosting its annual meeting in Chicago, IL, on October 13-14, 2014.

  8. SFU LIBRARY ANNUAL REPORT

    E-Print Network [OSTI]

    SFU LIBRARY ANNUAL REPORT 2006/07 #12;22 TABLE OF CONTENTS Message from the University Librarian................................................... ....................................... 7 WAC Bennett Library.................................................................. ....................................... 8 Samuel and Frances Belzberg Library

  9. 2007 Annual Report

    SciTech Connect (OSTI)

    none,

    2007-01-01T23:59:59.000Z

    This annual report includes: a brief overview of Western; FY 2007 highlights; FY 2007 Integrated Resource Planning, or IRP, survey; and financial data.

  10. Historical Natural Gas Annual

    U.S. Energy Information Administration (EIA) Indexed Site

    8 The Historical Natural Gas Annual contains historical information on supply and disposition of natural gas at the national, regional, and State level as well as prices at...

  11. Historical Natural Gas Annual

    U.S. Energy Information Administration (EIA) Indexed Site

    6 The Historical Natural Gas Annual contains historical information on supply and disposition of natural gas at the national, regional, and State level as well as prices at...

  12. Historical Natural Gas Annual

    U.S. Energy Information Administration (EIA) Indexed Site

    7 The Historical Natural Gas Annual contains historical information on supply and disposition of natural gas at the national, regional, and State level as well as prices at...

  13. Issue 5: High Interest in Hybrid Cars

    E-Print Network [OSTI]

    Ong, Paul M.; Haselhoff, Kim

    2005-01-01T23:59:59.000Z

    2005). “High Interest in Hybrid Cars. ” SCS Fact Sheet, Vol.May 2005 High Interest in Hybrid Cars I NTRODUCTION PublicThe unique features of a hybrid car mean that it is more

  14. Gravi-Leptogenesis: Leptogenesis From Gravity Waves in Pseudo-Scalar Driven Inflation Models

    SciTech Connect (OSTI)

    Alexander, S.H.; /Penn State U.; Peskin, Michael E.; /SLAC; Sheikh-Jabbari, M.M.; /IPM, Tehran

    2007-02-28T23:59:59.000Z

    In this talk we present a mechanism for leptogenesis which is based on gravity waves produced during inflation. We show that when inflation is driven by a pseudo-scalar field the metric perturbations generated during inflation can become birefringent, therefore giving a non-vanishing contribution to the gravitational triangle anomaly and sourcing lepton anti-lepton asymmetry. As this asymmetry is sourced by the fields which are active during inflation, it is not washed out or diluted by inflation. The amount of matter asymmetry generated in our model can be of realistic size for the parameters within the range of some inflationary scenarios and grand unified theories.

  15. UNIVERSITY POLICE ANNUAL SECURITY

    E-Print Network [OSTI]

    Kulp, Mark

    UNIVERSITY POLICE 2013 ANNUAL SECURITY AND FIRE SAFETY GUIDE In compliance with the Jeanne Clery Disclosure of Campus Security Policy and Campus Crime Statistics Act The University of New Orleans. Please take a moment to read the following information. #12;ANNUAL SECURITY AND FIRE SAFETY GUIDE 2013

  16. Annual Energy Review, 2008

    SciTech Connect (OSTI)

    None

    2009-06-01T23:59:59.000Z

    The Annual Energy Review (AER) is the Energy Information Administration's (EIA) primary report of annual historical energy statistics. For many series, data begin with the year 1949. Included are statistics on total energy production, consumption, trade, and energy prices; overviews of petroleum, natural gas, coal, electricity, nuclear energy, renewable energy, and international energy; financial and environment indicators; and data unit conversions.

  17. No Large Scale Curvature Perturbations during Waterfall of Hybrid Inflation

    E-Print Network [OSTI]

    Ali Akbar Abolhasani; Hassan Firouzjahi

    2011-01-18T23:59:59.000Z

    In this paper the possibility of generating large scale curvature perturbations induced from the entropic perturbations during the waterfall phase transition of standard hybrid inflation model is studied. We show that whether or not appreciable amounts of large scale curvature perturbations are produced during the waterfall phase transition depend crucially on the competition between the classical and the quantum mechanical back-reactions to terminate inflation. If one considers only the classical evolution of the system we show that the highly blue-tilted entropy perturbations induce highly blue-tilted large scale curvature perturbations during the waterfall phase transition which dominate over the original adiabatic curvature perturbations. However, we show that the quantum back-reactions of the waterfall field inhomogeneities produced during the phase transition dominate completely over the classical back-reactions. The cumulative quantum back-reactions of very small scales tachyonic modes terminate inflation very efficiently and shut off the curvature perturbations evolution during the waterfall phase transition. This indicates that the standard hybrid inflation model is safe under large scale curvature perturbations during the waterfall phase transition.

  18. Running of scalar spectral index in multi-field inflation

    E-Print Network [OSTI]

    Jinn-Ouk Gong

    2015-05-20T23:59:59.000Z

    We compute the running of the scalar spectral index in general multi-field slow-roll inflation. By incorporating explicit momentum dependence at the moment of horizon crossing, we can find the running straightforwardly. At the same time, we can distinguish the contributions from the quasi de Sitter background and the super-horizon evolution of the field fluctuations.

  19. No-boundary measure in the regime of eternal inflation

    SciTech Connect (OSTI)

    Hartle, James [Department of Physics, University of California, Santa Barbara, California 93106 (United States); Hawking, S. W. [DAMTP, CMS, Wilberforce Road, CB3 0WA Cambridge (United Kingdom); Hertog, Thomas [APC, UMR 7164 (CNRS, Universite Paris 7), 10 rue A. Domon et L. Duquet, 75205 Paris, France, and International Solvay Institutes, Boulevard du Triomphe, ULB-C.P. 231, 1050 Brussels (Belgium)

    2010-09-15T23:59:59.000Z

    The no-boundary wave function (NBWF) specifies a measure for prediction in cosmology that selects inflationary histories and remains well behaved for spatially large or infinite universes. This paper explores the predictions of the NBWF for linear scalar fluctuations about homogeneous and isotropic backgrounds in models with a single scalar field moving in a quadratic potential. We treat both the spacetime geometry of the universe and the observers inhabiting it quantum mechanically. We evaluate top-down probabilities for local observations that are conditioned on the NBWF and on part of our data as observers of the universe. For models where the most probable histories do not have a regime of eternal inflation, the NBWF predicts homogeneity on large scales, a spectrum of observable fluctuations with a small non-Gaussian component, and a small amount of inflation in our past. By contrast, for models where the dominant histories have a regime of eternal inflation, the NBWF predicts significant inhomogeneity on scales much larger than the present horizon, a Gaussian spectrum of observable fluctuations, and a long period of inflation in our past. The absence or presence of non-Gaussianity in our observable universe therefore provides information about its global structure, assuming the NBWF.

  20. INFLATABLE PLUG FOR THREAT MITIGATION IN TRANSPORTATION TUNNELS

    E-Print Network [OSTI]

    Barbero, Ever J.

    INFLATABLE PLUG FOR THREAT MITIGATION IN TRANSPORTATION TUNNELS Xavier Martinez1 , Julio Davalos2 and government entities. Fires, noxious fumes, deadly gasses, and flooding threats have occurred in major are of difficult and limited accessibility, but also because most of the potential threats, such as fires, flooding

  1. Inhomogeneous Cosmology, Inflation and Late-Time Accelerating Universe

    E-Print Network [OSTI]

    J. W. Moffat

    2007-05-30T23:59:59.000Z

    An exact inhomogeneous solution of Einstein's field equations is shown to be able to inflate in a non-uniform way in the early universe and explain anomalies in the WMAP power spectrum data. It is also possible for the model to explain the accelerated expansion of the universe by late-time inhomogeneous structure.

  2. Cosmology as Science: From Inflation to the Future

    ScienceCinema (OSTI)

    Lawrence Krauss

    2010-01-08T23:59:59.000Z

    Recent developments in cosmology bring to the forefront fundamental questions about our ability to falsify various fundamental assumptions about the universe.  I will discuss three issues that reflect different aspects of these questions:  (1) "Proving" Inflation (2) Anthropic "Explanations" (3) Cosmology of the far future.

  3. Inflating a Rubber Balloon 6GEJPKECN 7PKXGTUKV[ $GTNKP )GTOCP[

    E-Print Network [OSTI]

    Struchtrup, Henning

    Inflating a Rubber Balloon YA}N Ü,,ji 6GEJPKECN 7PKXGTUKV[ $GTNKP )GTOCP[ QjAAA} 7|i W |i V 7 the downward sloping part of the characteristic is `bridged' while the lung pressure relaxes. .H\\ :RUGV: Rubber of a spherical rubber balloon on its radius u, is non-monotonic, see [1] and Figure 1. If the stress

  4. Oscillations in the CMB from Axion Monodromy Inflation

    SciTech Connect (OSTI)

    Flauger, Raphael; /Texas U.; McAllister, Liam; Pajer, Enrico; /Cornell U., Phys. Dept.; Westphal, Alexander; /SLAC /Stanford U., Phys. Dept.; Xu, Gang; /Cornell U., Phys. Dept.

    2011-12-01T23:59:59.000Z

    We study the CMB observables in axion monodromy inflation. These well-motivated scenarios for inflation in string theory have monomial potentials over super-Planckian field ranges, with superimposed sinusoidal modulations from instanton effects. Such periodic modulations of the potential can drive resonant enhancements of the correlation functions of cosmological perturbations, with characteristic modulations of the amplitude as a function of wavenumber. We give an analytical result for the scalar power spectrum in this class of models, and we determine the limits that present data places on the amplitude and frequency of modulations. Then, incorporating an improved understanding of the realization of axion monodromy inflation in string theory, we perform a careful study of microphysical constraints in this scenario. We find that detectable modulations of the scalar power spectrum are commonplace in well-controlled examples, while resonant contributions to the bispectrum are undetectable in some classes of examples and detectable in others. We conclude that resonant contributions to the spectrum and bispectrum are a characteristic signature of axion monodromy inflation that, in favorable cases, could be detected in near-future experiments.

  5. Oscillations in the CMB from axion monodromy inflation

    SciTech Connect (OSTI)

    Flauger, Raphael [Department of Physics, University of Texas at Austin, Austin, TX 78712 (United States); McAllister, Liam; Pajer, Enrico; Xu, Gang [Department of Physics, Cornell University, Ithaca, NY 14853 (United States); Westphal, Alexander, E-mail: raphael.flauger@yale.edu, E-mail: mcallister@cornell.edu, E-mail: ep295@cornell.edu, E-mail: awestpha@stanford.edu, E-mail: gx26@cornell.edu [Department of Physics, Stanford University, Stanford, CA 94305 (United States)

    2010-06-01T23:59:59.000Z

    We study the CMB observables in axion monodromy inflation. These well-motivated scenarios for inflation in string theory have monomial potentials over super-Planckian field ranges, with superimposed sinusoidal modulations from instanton effects. Such periodic modulations of the potential can drive resonant enhancements of the correlation functions of cosmological perturbations, with characteristic modulations of the amplitude as a function of wavenumber. We give an analytical result for the scalar power spectrum in this class of models, and we determine the limits that present data places on the amplitude and frequency of modulations. Then, incorporating an improved understanding of the realization of axion monodromy inflation in string theory, we perform a careful study of microphysical constraints in this scenario. We find that detectable modulations of the scalar power spectrum are commonplace in well-controlled examples, while resonant contributions to the bispectrum are undetectable in some classes of examples and detectable in others. We conclude that resonant contributions to the spectrum and bispectrum are a characteristic signature of axion monodromy inflation that, in favorable cases, could be detected in near-future experiments.

  6. 2004 ANNUAL REPORT 2004 NHMFL ANNUAL REPORT

    E-Print Network [OSTI]

    Weston, Ken

    1 Year in Review 11 Year in Review 11 Year in Review 11 Year in Review 1 2 Science & Research formats for individuals with print-related accessibility needs. #12;2004 ANNUAL REPORT 1 Chapter 1 YEAR IN REVIEW 2004: The Magnet Lab Transitions into Its Second Decade Less than six months after stepping down

  7. CRADA ORGANIZATIONAL CONFLICTS OF INTEREST (OCI) CERTIFICATION

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    CRADA No. CRADA ORGANIZATIONAL CONFLICTS OF INTEREST (OCI) CERTIFICATION In accordance with Clause I.105 - Technology Transfer Mission, (n)(5)i of Contract No....

  8. Aligning Utility Interests with Energy Efficiency Objectives...

    Open Energy Info (EERE)

    Interests with Energy Efficiency Objectives: A Review of Recent Efforts at Decoupling and Performance Incentives Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Aligning...

  9. Avoiding the blue spectrum and the fine-tuning of initial conditions in hybrid inflation

    E-Print Network [OSTI]

    Sebastien Clesse; Jonathan Rocher

    2009-04-20T23:59:59.000Z

    Hybrid inflation faces two well-known problems: the blue spectrum of the non-supersymmetric version of the model and the fine-tuning of the initial conditions of the fields leading to sufficient inflation to account for the standard cosmological problems. They are investigated by studying the exact two-fields dynamics instead of assuming slow-roll. When the field values are restricted to be less than the reduced Planck mass, a non-negligible part of the initial condition space (around 15% depending on potential parameters) leads to successful inflation. Most of it is located outside the usual inflationary valley and organized in continuous patterns instead of being isolated as previously found. Their existence is explained and their properties are studied. This shows that no excessive fine-tuning is required for successful hybrid inflation. Moreover, by extending the initial condition space to planckian-like or super-planckian values, inflation becomes generically sufficiently long and can produce a red-tilted scalar power spectrum due to slow-roll violations. The robustness of these properties is confirmed by conducting our analysis on three other models of hybrid-type inflation in various framework: "smooth" and "shifted" inflation in SUSY and SUGRA, and "radion assisted" gauge inflation. A high percentage of successful inflation for smooth hybrid inflation (up to 80%) is observed.

  10. Personal Background andPersonal Background and AreasAreas ofof InterestInterest

    E-Print Network [OSTI]

    Boehning, Dankmar

    General Topics CurrentCurrent AreasAreas ofof InterestInterest ResearchResearch AreasAreas inin Preperation InterestInterest ResearchResearch AreasAreas inin PreperationPreperation #12;Personal BackgroundHistory BesidesBesides cooperatingcooperating inin severalseveral projectsprojects in SEin SE AsiaAsia oneone

  11. High Temperature Materials Laboratory User Program: 19th Annual Report, October 1, 2005 - September 30, 2006

    SciTech Connect (OSTI)

    Pasto, Arvid [ORNL

    2007-08-01T23:59:59.000Z

    Annual Report contains overview of the High Temperature Materials Laboratory User Program and includes selected highlights of user activities for FY2006. Report is submitted to individuals within sponsoring DOE agency and to other interested individuals.

  12. annual acm-siam symposium: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Tongue of Green River Shale. There are some populations on private land, mostly on energy company land, including one on Shell property. Brian K.: CNAP is interested 497 Annual...

  13. NERI 2004 Annual Report

    SciTech Connect (OSTI)

    None

    2004-01-01T23:59:59.000Z

    The United States Department of Energy (DOE) created the Nuclear Energy Research Initiative (NERI) in Fiscal Year (FY) 1999 in response to recommendations provided by the President's Committee of Advisors on Science and Technology. The purpose of NERI is to sponsor research and development (R&D) in the nuclear energy sciences to address the principal barriers to the future use of nuclear energy in the United States. NERI is helping to preserve the nuclear science and engineering infrastructure within the Nation's universities, laboratories, and industry, and is advancing the development of nuclear energy technology, enabling the United States to maintain a competitive position in nuclear science and technology. Research under this initiative also addresses issues associated with the maintenance of existing U.S. nuclear plants. The NERI program is managed and funded by DOE's Office of Nuclear Energy, Science and Technology. ''The Nuclear Energy Research Initiative 2004 Annual Report'' serves to inform interested parties of progress made in NERI on a programmatic level as well as research progress made on individual NERI projects. Section 2 of this report provides background on the creation and implementation of NERI and on the focus areas for NERI research. Section 3 provides a discussion on NERI's mission, goals and objectives, and work scope. Section 4 highlights the major accomplishments of the NERI projects and provides brief summaries of the NERI research efforts that were completed in 2004. Section 5 provides a discussion on the impact NERI has had on U.S. university nuclear programs. Sections 6 through 8 provide project status reports by research area for each of the fiscal year (FY) 2001 and 2002 projects that were active in FY 2004. Research objectives, progress made over the last year, and activities planned for the next year are described for each project. Sections 9 through 11 present each of the newly awarded 2005 NERI projects in their corresponding focus area. Each abstract includes a brief description of the project, its proposed work scope, and its participants. Project numbers are designated by the FY in which the award was made. At the end of the document, there is an Index of NERI Projects grouped by FY and sequentially ordered by project number.

  14. Petroleum Marketing Annual 2009

    U.S. Energy Information Administration (EIA) Indexed Site

    the 2010 data. Petroleum Marketing Annual --- Full report in PDF (1.2 MB) Summary Statistics Summary Statistics Tables PDF 1 Crude Oil Prices PDF TXT 1A Refiner Acquisition Cost...

  15. JAHRESBERICHT ANNUAL REPORT07

    E-Print Network [OSTI]

    Falge, Eva

    JAHRESBERICHT ANNUAL REPORT07 #12;Forschungsausblick Klaus J. Hopt über Corporate Governance Ferdi Schüth über zukünftige Energiesysteme Axel Ullrich über innovative Krebsmedikamente Research Outlook Klaus J. Hopt about Corporate Governance Ferdi Schüth about Future Energy Systems Axel Ullrich about New

  16. 2010 Annual Report

    SciTech Connect (OSTI)

    none,

    2010-01-01T23:59:59.000Z

    This annual report includes: an overview of Western; approaches for future hydropower and transmission service; major achievements in FY 2010; FY 2010 customer Integrated Resource Planning, or IRP, survey; and financial data.

  17. AFN Annual Convention

    Broader source: Energy.gov [DOE]

    The Alaska Federation of Natives (AFN) Convention is the largest representative annual gathering in the United States of any Native peoples. Delegates are elected on a population formula of one...

  18. Annual Energy Outlook 2013

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Mayer Brown Annual Global Energy Conference May 15, 2014 | Houston, TX By Adam Sieminski, EIA Administrator The U.S. has experienced a rapid increase in natural gas and oil...

  19. Annual Energy Outlook 2012

    Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]

    5 U.S. Energy Information Administration | Annual Energy Outlook 2012 Regional maps Figure F4. Oil and gas supply model regions Figure F4. Oil and Gas Supply Model Regions Atlantic...

  20. 2009 Annual Report

    SciTech Connect (OSTI)

    none,

    2009-01-01T23:59:59.000Z

    This annual report includes: a brief overview of Western; some of our major achievements in FY 2009; FY 2009 customer Integrated Resource Planning, or IRP, survey; and financial data.

  1. BCP Annual Rate Process

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    2015 BCP Annual Rate Process (FY 2016 Base Charge & Rate) Informal Process Rate Activity Schedule (doc) Informal Customer Meeting Thursday March 11, 2015 at 10:30 A.M. Conf Rms 3&4...

  2. Industrial & Systems Engineering Areas of Engineering Interests

    E-Print Network [OSTI]

    Berdichevsky, Victor

    Industrial & Systems Engineering Areas of Engineering Interests The Department of Industrial and Systems Engineering understands our students may work as Industrial Engineers in other engineering industries, and to help prepare them for these careers, the ISE Areas of Interest was formulated. The courses

  3. Strong Interest Inventory Profile with College Profile

    E-Print Network [OSTI]

    Peak, Derek

    Strong Interest Inventory ® Profile with College Profile College Profile developed by Jeffrey P Interest Inventory® Profile JANE SAMPLE Date taken 1.1.2005 F HOW THE STRONG CAN HELP YOU The Strong in your Strong results. Understanding your Strong Profile can help you identify a career focus and begin

  4. PUBLIC INTEREST DISCLOSURE (PID) POLICY AND PROCEDURES

    E-Print Network [OSTI]

    Greenslade, Diana

    i PUBLIC INTEREST DISCLOSURE (PID) POLICY AND PROCEDURES #12;PUBLIC INTEREST DISCLOSURE POLICY a disclosure under the PID Act 7 5.2. How to make a disclosure under the PID Act 7 6. PROCEDURES FOR AUTHORISED OFFICERS 9 7.1. Authorised Officer must provide information about the PID Act 9 7.2. Receiving

  5. Natural gas annual 1995

    SciTech Connect (OSTI)

    NONE

    1996-11-01T23:59:59.000Z

    The Natural Gas Annual provides information on the supply and disposition of natural gas to a wide audience including industry, consumers, Federal and State agencies, and educational institutions. The 1995 data are presented in a sequence that follows natural gas (including supplemental supplies) from its production to its end use. This is followed by tables summarizing natural gas supply and disposition from 1991 to 1995 for each Census Division and each State. Annual historical data are shown at the national level.

  6. Natural gas annual 1994

    SciTech Connect (OSTI)

    NONE

    1995-11-17T23:59:59.000Z

    The Natural Gas Annual provides information on the supply and disposition of natural gas to a wide audience including industry, consumers, Federal and State agencies, and educational institutions. The 1994 data are presented in a sequence that follows natural gas (including supplemental supplies) from its production to its end use. This is followed by tables summarizing natural gas supply and disposition from 1990 to 1994 for each Census Division and each State. Annual historical data are shown at the national level.

  7. Quintessential inflation on the brane and the relic gravity wave background

    SciTech Connect (OSTI)

    Sami, M.; Sahni, V. [Inter-University Centre for Astronomy and Astrophysics (IUCAA), Post Bag 4, Ganeshkhind, Pune 411 007 (India)

    2004-10-15T23:59:59.000Z

    Quintessential inflation describes a scenario in which both inflation and dark energy (quintessence) are described by the same scalar field. In conventional braneworld models of quintessential inflation gravitational particle-production is used to reheat the universe. This reheating mechanism is very inefficient and results in an excessive production of gravity waves which violate nucleosynthesis constraints and invalidate the model. We describe a new method of realizing quintessential inflation on the brane in which inflation is followed by 'instant preheating' (Felder, Kofman and Linde 1999). The larger reheating temperature in this model results in a smaller amplitude of relic gravity waves which is consistent with nucleosynthesis bounds. The relic gravity wave background has a 'blue' spectrum at high frequencies and is a generic byproduct of successful quintessential inflation on the brane.

  8. ISO(4,1) symmetry in the EFT of inflation

    SciTech Connect (OSTI)

    Creminelli, Paolo [Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151, Trieste (Italy); Emami, Razieh [School of Physics, Institute for Research in Fundamental Sciences (IPM), P. O. Box 19395-5531, Teheran (Iran, Islamic Republic of); Simonovi?, Marko; Trevisan, Gabriele, E-mail: creminel@ictp.it, E-mail: emami@mail.ipm.ir, E-mail: msimonov@sissa.it, E-mail: gtrevi@sissa.it [Scuola Internazionale Superiore di Studi Avanzati (SISSA), via Bonomea 265, 34136, Trieste (Italy)

    2013-07-01T23:59:59.000Z

    In DBI inflation the cubic action is a particular linear combination of the two, otherwise independent, cubic operators ?-dot {sup 3} and ?-dot (?{sub i}?){sup 2}. We show that in the Effective Field Theory (EFT) of inflation this is a consequence of an approximate 5D Poincar and apos;e symmetry, ISO(4,1), non-linearly realized by the Goldstone ?. This symmetry uniquely fixes, at lowest order in derivatives, all correlation functions in terms of the speed of sound c{sub s}. In the limit c{sub s} ? 1, the ISO(4,1) symmetry reduces to the Galilean symmetry acting on ?. On the other hand, we point out that the non-linear realization of SO(4,2), the isometry group of 5D AdS space, does not fix the cubic action in terms of c{sub s}.

  9. Breaking discrete symmetries in the effective field theory of inflation

    E-Print Network [OSTI]

    Dario Cannone; Jinn-Ouk Gong; Gianmassimo Tasinato

    2015-05-29T23:59:59.000Z

    We study the phenomenon of discrete symmetry breaking during the inflationary epoch, using a model-independent approach based on the effective field theory of inflation. We work in a context where both time reparameterization symmetry and spatial diffeomorphism invariance can be broken during inflation. We determine the leading derivative operators in the quadratic action for fluctuations that break parity and time-reversal. Within suitable approximations, we study their consequences for the dynamics of linearized fluctuations. Both in the scalar and tensor sectors, we show that such operators can lead to new direction-dependent phases for the modes involved. They do not affect the power spectra, but can have consequences for higher correlation functions. Moreover, a small quadrupole contribution to the sound speed can be generated.

  10. A new parameter in attractor single-field inflation

    E-Print Network [OSTI]

    Jinn-Ouk Gong; Misao Sasaki

    2015-06-16T23:59:59.000Z

    We revisit the notion of slow-roll in the context of general single-field inflation. As a generalization of slow-roll dynamics, we consider an inflaton $\\phi$ in an attractor phase where the time derivative of $\\phi$ is determined by a function of $\\phi$, $\\dot\\phi=\\dot\\phi(\\phi)$. In other words, we consider the case when the number of $e$-folds $N$ counted backward in time from the end of inflation is solely a function of $\\phi$, $N=N(\\phi)$. In this case, it is found that we need a new independent parameter to properly describe the dynamics of the inflaton field in general, in addition to the standard parameters conventionally denoted by $\\epsilon$, $\\eta$, $c_s^2$ and $s$. Two illustrative examples are presented to discuss the non-slow-roll dynamics of the inflaton field consistent with observations.

  11. A new parameter in attractor single-field inflation

    E-Print Network [OSTI]

    Gong, Jinn-Ouk

    2015-01-01T23:59:59.000Z

    We revisit the notion of slow-roll in the context of general single-field inflation. As a generalization of slow-roll dynamics, we consider an inflaton $\\phi$ in an attractor phase where the time derivative of $\\phi$ is determined by a function of $\\phi$, $\\dot\\phi=\\dot\\phi(\\phi)$. In other words, we consider the case when the number of $e$-folds $N$ counted backward in time from the end of inflation is solely a function of $\\phi$, $N=N(\\phi)$. In this case, it is found that we need a new independent parameter to properly describe the dynamics of the inflaton field in general, in addition to the standard parameters conventionally denoted by $\\epsilon$, $\\eta$, $c_s^2$ and $s$. Two illustrative examples are presented to discuss the non-slow-roll dynamics of the inflaton field consistent with observations.

  12. Axion inflation with gauge field production and primordial black holes

    E-Print Network [OSTI]

    Edgar Bugaev; Peter Klimai

    2014-10-19T23:59:59.000Z

    We study the process of primordial black hole (PBH) formation at the beginning of radiation era for the cosmological scenario in which the inflaton is a pseudo-Nambu-Goldstone boson (axion) and there is a coupling of the inflaton with some gauge field. In this model inflation is accompanied by the gauge quanta production and a strong rise of the curvature power spectrum amplitude at small scales (along with non-Gaussianity) is predicted. We show that data on PBH searches can be used for a derivation of essential constraints on the model parameters in such an axion inflation scenario. We compare our numerical results with the similar results published earlier, in the work by Linde et al.

  13. Weak Gravity Strongly Constrains Large-Field Axion Inflation

    E-Print Network [OSTI]

    Ben Heidenreich; Matthew Reece; Tom Rudelius

    2015-06-10T23:59:59.000Z

    Models of large-field inflation based on axion-like fields with shift symmetries can be simple and natural, and make a promising prediction of detectable primordial gravitational waves. The Weak Gravity Conjecture is known to constrain the simplest case in which a single axion descends from a gauge field in an extra dimension. By supplementing the Weak Gravity Conjecture with considerations of how the mass spectrum of the theory varies across the axion moduli space, we obtain more powerful constraints that apply to a variety of multi-axion theories including N-flation and alignment models. In every case that we consider, plausible assumptions lead to field ranges that cannot be parametrically larger than the Planck scale. Our results are strongly suggestive of a general inconsistency in models of large-field inflation based on axions, and possibly of a more general principle forbidding super-Planckian field ranges.

  14. Weak Gravity Strongly Constrains Large-Field Axion Inflation

    E-Print Network [OSTI]

    Heidenreich, Ben; Rudelius, Tom

    2015-01-01T23:59:59.000Z

    Models of large-field inflation based on axion-like fields with shift symmetries can be simple and natural, and make a promising prediction of detectable primordial gravitational waves. The Weak Gravity Conjecture is known to constrain the simplest case in which a single axion descends from a gauge field in an extra dimension. By supplementing the Weak Gravity Conjecture with considerations of how the mass spectrum of the theory varies across the axion moduli space, we obtain more powerful constraints that apply to a variety of multi-axion theories including N-flation and alignment models. In every case that we consider, plausible assumptions lead to field ranges that cannot be parametrically larger than the Planck scale. Our results are strongly suggestive of a general inconsistency in models of large-field inflation based on axions, and possibly of a more general principle forbidding super-Planckian field ranges.

  15. Observational consequences of chaotic inflation with nonminimal coupling to gravity

    SciTech Connect (OSTI)

    Linde, Andrei; Noorbala, Mahdiyar [Stanford Institute for Theoretical Physics and Department of Physics, Stanford University, Stanford, CA 94305 (United States); Westphal, Alexander, E-mail: alinde@stanford.edu, E-mail: noorbala@stanford.edu, E-mail: alexander.westphal@desy.de [Deutsches Elektronen-Synchrotron DESY, Theory Group, D-22603 Hamburg (Germany)

    2011-03-01T23:59:59.000Z

    Recently there was an extensive discussion of Higgs inflation in the theory with the potential ?/4 (?{sup 2}?v{sup 2}){sup 2} and nonminimal coupling to gravity ?/2 ?{sup 2}R, for ? >> 1 and v || 1. We extend this investigation to the theories m{sup 2}/2 ?{sup 2} and ?/4 (?{sup 2}?v{sup 2}){sup 2} with arbitrary values of ? and v and describe implementation of these models in supergravity. We analyze observational consequences of these models and find a surprising coincidence of the inflationary predictions of the model ?/4 (?{sup 2}?v{sup 2}){sup 2} with ? < 0 in the limit |?|v{sup 2} ? 1 with the predictions of the Higgs inflation scenario for ? >> 1.

  16. The Gravitational Wave Background and Higgs False Vacuum Inflation

    E-Print Network [OSTI]

    Isabella Masina

    2014-03-20T23:59:59.000Z

    For a narrow band of values of the top quark and Higgs boson masses, the Standard Model Higgs potential develops a shallow local minimum at energies of about $10^{16}$ GeV, where primordial inflation could have started in a cold metastable state. For each point of that band, the highness of the Higgs potential at the false minimum is calculable, and there is an associated prediction for the inflationary gravitational wave background, namely for the tensor to scalar ratio $r$. We show that the recent measurement of $r$ by the BICEP2 collaboration, $r=0.16 _{-0.05}^{+0.06}$ at $1\\sigma$, combined with the most up-to-date measurements of the top quark and Higgs boson masses, reveals that the hypothesis that a Standard Model shallow false minimum was the source of inflation in the early Universe is viable.

  17. ISO(4,1) Symmetry in the EFT of Inflation

    E-Print Network [OSTI]

    Paolo Creminelli; Razieh Emami; Marko Simonovi?; Gabriele Trevisan

    2014-02-27T23:59:59.000Z

    In DBI inflation the cubic action is a particular linear combination of the two, otherwise independent, cubic operators \\dot \\pi^3 and \\dot \\pi (\\partial_i \\pi)^2. We show that in the Effective Field Theory (EFT) of inflation this is a consequence of an approximate 5D Poincar\\'e symmetry, ISO(4,1), non-linearly realized by the Goldstone \\pi. This symmetry uniquely fixes, at lowest order in derivatives, all correlation functions in terms of the speed of sound c_s. In the limit c_s \\to 1, the ISO(4,1) symmetry reduces to the Galilean symmetry acting on \\pi. On the other hand, we point out that the non-linear realization of SO(4,2), the isometry group of 5D AdS space, does not fix the cubic action in terms of c_s.

  18. Inflation and CMB Anisotropy from Quantum Metric Fluctuations

    E-Print Network [OSTI]

    Leonid Marochnik; Daniel Usikov

    2015-02-08T23:59:59.000Z

    We propose a model of cosmological evolution of the early and late Universe which is consistent with observational data and naturally explains the origin of inflation and dark energy. We show that the de Sitter accelerated expansion of the FLRW space with no matter fields (hereinafter, empty space) is its natural state, and the model does not require either a scalar field or cosmological constant or any other hypotheses. This is due to the fact that the de Sitter state is an exact solution of the rigorous mathematically consistent equations of one-loop quantum gravity for the empty FLRW space that are finite off the mass shell. Space without matter fields is not empty, as it always has the natural quantum fluctuations of the metric, i.e. gravitons. Therefore, the empty (in this sense) space is filled with gravitons, which have the backreaction effect on its evolution over time forming a self-consistent de Sitter instanton leading to the exponentially accelerated expansion of the Universe. At the start and the end of cosmological evolution, the Universe is assumed to be empty, which explains the origin of inflation and dark energy. This scenario leads to the prediction that the signs of the parameter 1+w should be opposite in both cases, and this fact is consistent with observations. The fluctuations of the number of gravitons lead to fluctuations of their energy density which in turn leads to the observed CMB temperature anisotropy of the order of 10^-5 and CMB polarization. In the frame of this scenario, it is not a hypothetical scalar field that generates inflation and relic gravitational waves but on the contrary, the gravitational waves (gravitons) generate dark energy, inflation, CMB anisotropy and polarization.

  19. A First Look at Preheating after Axion Monodromy Inflation

    E-Print Network [OSTI]

    Moghaddam, Hossein Bazrafshan

    2015-01-01T23:59:59.000Z

    We take a first look at preheating after axion monodromy inflation, assuming a standard coupling between the inflaton field and a scalar matter field. We find that in spite of the fact that the oscillation of the inflaton about the field value which minimizes the potential is anharmonic, there is nevertheless a parametric resonance instability, and we determine the Floquet exponent which describes this instability as a function of the parameters of the axion monodromy potential.

  20. Brane-antibrane backreaction in axion monodromy inflation

    SciTech Connect (OSTI)

    Conlon, Joseph P., E-mail: j.conlon1@physics.ox.ac.uk [Rudolf Peierls Center for Theoretical Physics, 1 Keble Road, Oxford OX1 3NP (United Kingdom)

    2012-01-01T23:59:59.000Z

    We calculate the interaction potential between D5 and D-bar 5 branes wrapping distant but homologous 2-cycles. The interaction potential is logarithmic in the separation radius and does not decouple at infinity. We show that logarithmic backreaction is generic for 5-branes wrapping distant but homologous 2-cycles, and we argue that this destabilises models of axion monodromy inflation involving NS5 brane-antibrane pairs in separate warped throats towards an uncontrolled region.

  1. Degravitation, inflation and the cosmological constant as an afterglow

    SciTech Connect (OSTI)

    Patil, Subodh P., E-mail: subodh@physik.hu-berlin.de [Humboldt Universitaet zu Berlin, Institut fuer Physik, Newtonstrasse 15, D-12489 Berlin (Germany)

    2009-01-15T23:59:59.000Z

    In this report, we adopt the phenomenological approach of taking the degravitation paradigm seriously as a consistent modification of gravity in the IR, and investigate its consequences for various cosmological situations. We motivate degravitation - where Netwon's constant is promoted to a scale dependent filter function - as arising from either a small (resonant) mass for the graviton, or as an effect in semi-classical gravity. After addressing how the Bianchi identities are to be satisfied in such a set up, we turn our attention towards the cosmological consequences of degravitation. By considering the example filter function corresponding to a resonantly massive graviton (with a filter scale larger than the present horizon scale), we show that slow roll inflation, hybrid inflation and old inflation remain quantitatively unchanged. We also find that the degravitation mechanism inherits a memory of past energy densities in the present epoch in such a way that is likely significant for present cosmological evolution. For example, if the universe underwent inflation in the past due to it having tunneled out of some false vacuum, we find that degravitation implies a remnant 'afterglow' cosmological constant, whose scale immediately afterwards is parametrically suppressed by the filter scale (L) in Planck units {Lambda} {approx} l{sup 2}{sub pl}/L{sup 2}. We discuss circumstances through which this scenario reasonably yields the presently observed value for {Lambda} {approx} O(10{sup -120}). We also find that in a universe still currently trapped in some false vacuum state, resonance graviton models of degravitation only degravitate initially Planck or GUT scale energy densities down to the presently observed value over timescales comparable to the filter scale. We argue that different functional forms for the filter function will yield similar conclusions. In this way, we argue that although the degravitation models we study have the potential to explain why the cosmological constant is not large in addition to why it is not zero, it does not satisfactorily address the co-incidence problem without additional tuning.

  2. A semi-analytical approach to perturbations in mutated hilltop inflation

    E-Print Network [OSTI]

    Barun Kumar Pal; Supratik Pal; B. Basu

    2012-01-04T23:59:59.000Z

    We study cosmological perturbations and observational aspects for mutated hilltop model of inflation. Employing mostly analytical treatment, we evaluate observable parameters during inflation as well as post-inflationary perturbations. This further leads to exploring observational aspects related to Cosmic Microwave Background (CMB) radiation. This semi-analytical treatment reduces complications related to numerical computation to some extent for studying the different phenomena related to CMB angular power spectrum for mutated hilltop inflation.

  3. Prof. K. Sato's group as of 1986 (6 years after proposing inflation)

    E-Print Network [OSTI]

    Yamamoto, Hirosuke

    (1981)467; PLB99(1981)66, A. Guth PRD23(1981)347 cf New inflation A. Linde PLB108(1982)389, Albrechet & Steinhardt PRL 48(1982)1220 R2 theory A. Starobinskiy PLB91(1980)99 Chaotic inflation A. Linde PLB129(1983)177 #12;1981 eternal inflation of Vilenkin and Linde #12; Astronomical Herald March, 1991 (by Astronomical

  4. Fractal initial conditions and natural parameter values in hybrid inflation

    E-Print Network [OSTI]

    Sebastien Clesse; Christophe Ringeval; Jonathan Rocher

    2009-12-22T23:59:59.000Z

    We show that the initial field values required to produce inflation in the two fields original hybrid model, and its supergravity F-term extension, do not suffer from any fine-tuning problem, even when the fields are restricted to be sub-planckian and for almost all potential parameter values. This is due to the existence of an initial slow-roll violating evolution which has been overlooked so far. Due to the attractor nature of the inflationary valley, these trajectories end up producing enough accelerated expansion of the universe. By numerically solving the full non-linear dynamics, we show that the set of such successful initial field values is connected, of dimension two and possesses a fractal boundary of infinite length exploring the whole field space. We then perform a Monte-Carlo-Markov-Chain analysis of the whole parameter space consisting of the initial field values, field velocities and potential parameters. We give the marginalised posterior probability distributions for each of these quantities such that the universe inflates long enough to solve the usual cosmological problems. Inflation in the original hybrid model and its supergravity version appears to be generic and more probable by starting outside of the inflationary valley. Finally, the implication of our findings in the context of the eternal inflationary scenario are discussed.

  5. Testing supersymmetric Higgs inflation with non-Gaussianity

    E-Print Network [OSTI]

    Shinsuke Kawai; Jinsu Kim

    2015-02-24T23:59:59.000Z

    We investigate multi-field signatures of the nonminimally coupled supersymmetric Higgs inflation-type cosmological scenario, focusing on the two-field Higgs-lepton inflation model as a concrete example. This type of inflationary model is realized in a theory beyond the Standard Model embedded in supergravity with a noncanonical K\\"{a}hler potential. We employ the backward $\\delta N$ formalism to compute cosmological observables, including the scalar and tensor power spectra, the spectral indices, the tensor-to-scalar ratio and the local-type nonlinearity parameter. The trajectory of the inflaton is controlled by the initial conditions of the inflaton as well as by the coefficients in the K\\"{a}hler potential. We analyze the bispectrum of the primordial fluctuations when the inflaton trajectory deviates from a straight line, and obtain constraints on the noncanonical terms of the K\\"{a}hler potential using the Planck satellite data. Our analysis represents a concrete particle phenomenology-based case study of inflation in which primordial non-Gaussianities can reveal aspects of supergravity.

  6. Just enough inflation: power spectrum modifications at large scales

    E-Print Network [OSTI]

    Michele Cicoli; Sean Downes; Bhaskar Dutta; Francisco G. Pedro; Alexander Westphal

    2014-07-03T23:59:59.000Z

    We show that models of `just enough' inflation, where the slow-roll evolution lasted only $50-60$ e-foldings, feature modifications of the CMB power spectrum at large angular scales. We perform a systematic and model-independent analysis of any possible non-slow-roll background evolution prior to the final stage of slow-roll inflation. We find a high degree of universality since most common backgrounds like fast-roll evolution, matter or radiation-dominance give rise to a power loss at large angular scales and a peak together with an oscillatory behaviour at scales around the value of the Hubble parameter at the beginning of slow-roll inflation. Depending on the value of the equation of state parameter, different pre-inflationary epochs lead instead to an enhancement of power at low-$\\ell$, and so seem disfavoured by recent observational hints for a lack of CMB power at $\\ell\\lesssim 40$. We also comment on the importance of initial conditions and the possibility to have multiple pre-inflationary stages.

  7. Jordan frame supergravity and inflation in the NMSSM

    SciTech Connect (OSTI)

    Ferrara, Sergio [Physics Department, Theory Unit, CERN, CH 1211, Geneva 23 (Switzerland); INFN - Laboratori Nazionali di Frascati, Via Enrico Fermi 40, 00044 Frascati (Italy); Kallosh, Renata; Linde, Andrei [Department of Physics, Stanford University, Stanford, California 94305 (United States); Marrani, Alessio; Van Proeyen, Antoine [Instituut voor Theoretische Fysica, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven (Belgium)

    2010-08-15T23:59:59.000Z

    We present a complete explicit N=1, d=4 supergravity action in an arbitrary Jordan frame with nonminimal scalar-curvature coupling of the form {Phi}(z,z)R. The action is derived by suitably gauge fixing the superconformal action. The theory has a modified Kaehler geometry, and it exhibits a significant dependence on the frame function {Phi}(z,z) and its derivatives over scalars, in the bosonic as well as in the fermionic part of the action. Under certain simple conditions, the scalar kinetic terms in the Jordan frame have a canonical form. We consider an embedding of the next-to-minimal supersymmetric standard model (NMSSM) gauge theory into supergravity, clarifying the Higgs inflation model recently proposed by Einhorn and Jones. We find that the conditions for canonical kinetic terms are satisfied for the NMSSM scalars in the Jordan frame, which leads to a simple action. However, we find that the gauge singlet field experiences a strong tachyonic instability during inflation in this model. Thus, a modification of the model is required to support the Higgs-type inflation.

  8. Cosmic inflation in a landscape of heavy-fields

    SciTech Connect (OSTI)

    Céspedes, Sebastián; Palma, Gonzalo A., E-mail: scespede@ing.uchile.cl, E-mail: gpalmaquilod@ing.uchile.cl [Physics Department, FCFM, Universidad de Chile, Blanco Encalada 2008, Santiago (Chile)

    2013-10-01T23:59:59.000Z

    Heavy isocurvature fields may have a strong influence on the low energy dynamics of curvature perturbations during inflation, as long as the inflationary trajectory becomes non-geodesic in the multi-field target space (the landscape). If fields orthogonal to the inflationary trajectory are sufficiently heavy, one expects a reliable effective field theory describing the low energy dynamics of curvature perturbations, with self-interactions determined by the shape of the inflationary trajectory. Previous work analyzing the role of heavy-fields during inflation have mostly focused in the effects on curvature perturbations due to a single heavy-field. In this article we extend the results of these works by studying models of inflation in which curvature perturbations interact with two heavy-fields. We show that the second heavy-field (orthogonal to both tangent and normal directions of the inflationary trajectory) may significantly affect the evolution of curvature modes. We compute the effective field theory for the low energy curvature perturbations obtained by integrating out the two heavy-fields and show that the presence of the second heavy-field implies the existence of additional self-interactions not accounted for in the single heavy-field case. We conclude that future observations will be able to constrain the number of heavy fields interacting with curvature perturbations.

  9. Copyright and the public interest in China 

    E-Print Network [OSTI]

    Tang, Guan Hong

    2009-01-01T23:59:59.000Z

    This thesis will consider how the multidimensional public interest concept at once informs development of Chinese copyright law and also limits it. Since 1990 China has awarded copyright - individual rights - but also ...

  10. Energy Efficiency Interest Rate Reduction Program

    Broader source: Energy.gov [DOE]

    The Alaska Housing Finance Corporation (AHFC) offers interest rate reductions to home buyers purchasing new and existing homes with 5 Star and 5 Star Plus energy ratings. All homes constructed on...

  11. Alabama successes spur interest in eastern Gulf

    SciTech Connect (OSTI)

    Redden, J.

    1985-11-01T23:59:59.000Z

    The shallow waters of the eastern fringe of the Gulf of Mexico are becoming a world-class offshore gas play. Spurred by the success ratio offshore Alabama, the water off Mississippi and Florida are drawing intense interest as oil companies attempt to extend the prolific Norphlet formation. Sitting at the heart of the recent interest in the eastern Gulf are the state and federal waters off Alabama. Exploration and drilling activity in the area are discussed.

  12. Annual Report GreenTouch 20102011 Annual Report

    E-Print Network [OSTI]

    Lefèvre, Laurent

    2010­2011 Annual Report #12;1 GreenTouch 2010­2011 Annual Report Contents Chairman's Letter............................................................ 30 Service Energy Aware Sustainable Optical Networks (SEASON............................................................................................ 43 Beyond Cellular Green Generation (BCG2

  13. Annual Performance Report FY 2004 Annual Performance Plan FY...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    DOEIG-APP-007 Annual Performance Report FY 2004 Annual Performance Plan FY 2005, DOEIG-APP-007 I am pleased to present the Office of Inspector General's (OIG's) combined...

  14. Annual Site EnvironmentalAnnual Site Environmental ReportReport

    E-Print Network [OSTI]

    ) .................................................8 3.1.3 National Environmental Policy Act (NEPA#12;Annual Site EnvironmentalAnnual Site Environmental ReportReport for Calendar Year1997 ENVIRONMENTAL REPORT Table of Contents Page 1.0 EXECUTIVE SUMMARY

  15. Natural gas annual 1997

    SciTech Connect (OSTI)

    NONE

    1998-10-01T23:59:59.000Z

    The Natural Gas Annual provides information on the supply and disposition of natural gas to a wide audience including industry, consumers, Federal and State agencies, and educational institutions. The 1997 data are presented in a sequence that follows natural gas (including supplemental supplies) from its production to its end use. This is followed by tables summarizing natural gas supply and disposition from 1993 to 1997 for each Census Division and each State. Annual historical data are shown at the national level. 27 figs., 109 tabs.

  16. International energy annual 1996

    SciTech Connect (OSTI)

    NONE

    1998-02-01T23:59:59.000Z

    The International Energy Annual presents an overview of key international energy trends for production, consumption, imports, and exports of primary energy commodities in over 220 countries, dependencies, and areas of special sovereignty. Also included are population and gross domestic product data, as well as prices for crude oil and petroleum products in selected countries. Renewable energy reported in the International Energy Annual includes hydroelectric power, geothermal, solar, and wind electric power, biofuels energy for the US, and biofuels electric power for Brazil. New in the 1996 edition are estimates of carbon dioxide emissions from the consumption of petroleum and coal, and the consumption and flaring of natural gas. 72 tabs.

  17. Annual Site Environmental Report

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office511041cloth DocumentationProductsAlternative FuelsSanta3 Table 3.EnergyAug412 ArchiveAnnualAnnual2013

  18. ANNUAL SECURITY FIRE SAFETY REPORT

    E-Print Network [OSTI]

    ANNUAL SECURITY AND FIRE SAFETY REPORT OCTOBER 1, 2013 DARTMOUTH COLLEGE http://www.dartmouth.edu/~security/ #12;1 Table of Contents MESSAGE FROM THE DIRECTOR OF SAFETY AND SECURITY................................................................................................................................................................... 7 ANNUAL SECURITY REPORT

  19. 2011 Quality Council Annual Report

    Broader source: Energy.gov [DOE]

    DEPARTMENT OF ENERGY QUALITY COUNCIL ANNUAL REPORT For Calendar Year 2011 Office of Health Safety and Security

  20. NCAI 71st Annual Convention

    Broader source: Energy.gov [DOE]

    Save the date for the National Congress of American Indians (NCAI) 71st Annual Convention at the Hyatt Regency Atlanta.

  1. Interested Parties - Smith Dawson & Andrews | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    09-03-10SmithDawsonAndrews.pdf More Documents & Publications Interested Parties - ARPA-E National Association of Manufacturers Interested Parties - Chrystler Interested...

  2. Postdoctoral Research Awards Annual Research Meeting: Joseph...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Joseph Mondloch Postdoctoral Research Awards Annual Research Meeting: Joseph Mondloch Postdoctoral Research Awards Annual Research Meeting: Joseph Mondloch poster presentation....

  3. Mathematical Modeling of the First Inflation of Degassed Lungs BELA SUKI,* JOSE S. ANDRADE, JR.,

    E-Print Network [OSTI]

    Stanley, H. Eugene

    Mathematical Modeling of the First Inflation of Degassed Lungs BE´LA SUKI,* JOSE´ S. ANDRADE, JR--The pressure­volume (P­V) relationship of de- gassed lungs during the first inflation is different from and degassed rabbit lungs. By fitting these data, we found that n 17 5, Plow 23 4 cmH2O

  4. The Curvaton Hypothesis and the eta-problem of Quintessential Inflation, with and without Branes

    E-Print Network [OSTI]

    Konstantinos Dimopoulos

    2002-12-11T23:59:59.000Z

    It is argued why, contrary to expectations, steep brane-inflation cannot really help in overcoming the eta-problem of quintessential inflation model-building. In contrast it is shown that the problem is substantially ameliorated under the curvaton hypothesis. This is quantified by considering possible modular quintessential inflationary models in the context of both standard and brane cosmology.

  5. DIEL CHANGES IN SWIM BLADDER INFLATION OF THE LARVAE OF THE NORTHERN ANCHOVY, ENGRAULIS MORDAX

    E-Print Network [OSTI]

    . Maximum night levels of inflation were attained 2 h after the onset of dark and typical day levels their bladders at night by swallowing air at the water surface and the vertical distribution of sea-caught larvae was viewed as an energy sparing mechanism. Measurements of sinking speed of larvae with and without inflated

  6. Impedance measurements of ex vivo rat lung at different volumes of inflation

    E-Print Network [OSTI]

    Illinois at Urbana-Champaign, University of

    Impedance measurements of ex vivo rat lung at different volumes of inflation Michael L. Oelze that the occurrence of ultrasonically induced lung hemorrhage in rats was directly correlated to the level of lung inflation. In that study, it was hypothesized that the lung could be modeled as two components consisting

  7. AnnualReport Franz Graf

    E-Print Network [OSTI]

    Middeldorp, Aart

    2011 AnnualReport #12;Franz Graf Cover design adapted from "76543210" Graphite and India ink with symbolic representations of CoSMIC DIMEnSIonS. [...] And yet the sequences of lines are laced Schmidt (excerpts) Ornament, symbol, reversed writing, shadow lines #12;#12;AnnuAl RepoRt 2011 Annual

  8. Data Management Group Annual Report

    E-Print Network [OSTI]

    Toronto, University of

    Data Management Group Annual Report 1997 #12;Data Management Group Annual Report 1997 A co-operative project that is jointly funded by members of the Toronto Area Transportation Planning Data Collection: (416) 978-3941 #12;Data Management Group 1997 Annual Report Table of Contents 1 INTRODUCTION

  9. 2012ANNUAL REPORT AND ACCOUNTS

    E-Print Network [OSTI]

    Birmingham, University of

    and Estimation Techniques 21 Consolidated Income and Expenditure Account 25 Balance Sheets 26 Consolidated Cash Flow Statement 28 Consolidated Statement of Total Recognised Gains and Losses 29 Notes to the Accounts2011 2012ANNUAL REPORT AND ACCOUNTS #12;Annual Report and Accounts 2011/12 32 Annual Report

  10. University Library Annual Report

    E-Print Network [OSTI]

    Brierley, Andrew

    and a recognition of the need to provide zones within the building for different types of library user behaviourUniversity Library Annual Report 2011-2012 #12;Academic Year 2011-12 brought with it another period of turbulent change ­ most of it positive ­ for the University Library. The major and very tangible difference

  11. International Energy Annual, 1992

    SciTech Connect (OSTI)

    Not Available

    1994-01-14T23:59:59.000Z

    This report is prepared annually and presents the latest information and trends on world energy production and consumption for petroleum, natural gas, coal, and electricity. Trade and reserves are shown for petroleum, natural gas, and coal. Prices are included for selected petroleum products. Production and consumption data are reported in standard units as well as British thermal units (Btu) and joules.

  12. Annual Report and Accounts

    E-Print Network [OSTI]

    ;#12;Forest Research Annual Report and Accounts 2010­2011 Presented to the House of Commons pursuant to Section 7 of The Government Resources and Accounts Act 2000 Ordered by the House of Commons to be printed ...................................................... 12 Centre for Human and Ecological Sciences

  13. NERSC Annual Report 2005

    SciTech Connect (OSTI)

    Hules (Ed.), John

    2006-07-31T23:59:59.000Z

    The National Energy Research Scientific Computing Center (NERSC) is the premier computational resource for scientific research funded by the DOE Office of Science. The Annual Report includes summaries of recent significant and representative computational science projects conducted on NERSC systems as well as information about NERSC's current and planned systems and services.

  14. Annual Report Competence Center

    E-Print Network [OSTI]

    Sandoghdar, Vahid

    : Fröhlich Druck AG www.froehlich.ch 4 #12;Contents 1 About C4 7 2 The Year in Review 9 3 The C4 Network;2 The Year in Review About this C4 Annual Report Over the past two decades, the C4 Network has grown

  15. 2008 annual report Chapterhead

    E-Print Network [OSTI]

    Weston, Ken

    -mail hedick@magnet.fsu.edu. Chapter 1 2008 Year in review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194 researChhighlights #12;2008 annual report CHapter 1 3 2008-Yearinreview Chapter 1: 2008 - Year in review all user programs and magnets operated throughout 2008! that is really saying something, because

  16. NERSC Annual Report 2002

    SciTech Connect (OSTI)

    Hules, John

    2003-01-31T23:59:59.000Z

    The National Energy Research Scientific Computing Center (NERSC) is the primary computational resource for scientific research funded by the DOE Office of Science. The Annual Report for FY2002 includes a summary of recent computational science conducted on NERSC systems (with abstracts of significant and representative projects), and information about NERSC's current and planned systems and service

  17. ANNUAL REPORT 2011 OFFICEOFSPONSOREDPROJECTS

    E-Print Network [OSTI]

    Karonis, Nicholas T.

    Projects presents the Fiscal Year 2011 Annual Report on external funding at Northern Illinois University where the University experienced a significant increase in funding due to both the continued to comprehensively account for external funding for the university's core mission activities, this year's report also

  18. TRANSPORTATION Annual Report

    E-Print Network [OSTI]

    Minnesota, University of

    2003 CENTER FOR TRANSPORTATION STUDIES Annual Report #12;Center for Transportation Studies University of Minnesota 200 Transportation and Safety Building 511 Washington Avenue S.E. Minneapolis, MN publication is a report of transportation research, education, and outreach activities for the period July

  19. Guaranteed annual wages

    E-Print Network [OSTI]

    Weber, Donald Albert

    1957-01-01T23:59:59.000Z

    in the world, wms in a serious soon omio slump in 1937? At, that time, U? S? Steel had 260, %R employees on 17 7'guaranteed Annual Wag~ill It Workt?" ~Sio ~S +~s i , Narch 2, 1955, Vol. 66, No. 5, p, 7, 5? 6. 70 its payrolls If the company would have...

  20. Uranium industry annual 1998

    SciTech Connect (OSTI)

    NONE

    1999-04-22T23:59:59.000Z

    The Uranium Industry Annual 1998 (UIA 1998) provides current statistical data on the US uranium industry`s activities relating to uranium raw materials and uranium marketing. It contains data for the period 1989 through 2008 as collected on the Form EIA-858, ``Uranium Industry Annual Survey.`` Data provides a comprehensive statistical characterization of the industry`s activities for the survey year and also include some information about industry`s plans and commitments for the near-term future. Data on uranium raw materials activities for 1989 through 1998, including exploration activities and expenditures, EIA-estimated reserves, mine production of uranium, production of uranium concentrate, and industry employment, are presented in Chapter 1. Data on uranium marketing activities for 1994 through 2008, including purchases of uranium and enrichment services, enrichment feed deliveries, uranium fuel assemblies, filled and unfilled market requirements, and uranium inventories, are shown in Chapter 2. The methodology used in the 1998 survey, including data edit and analysis, is described in Appendix A. The methodologies for estimation of resources and reserves are described in Appendix B. A list of respondents to the ``Uranium Industry Annual Survey`` is provided in Appendix C. The Form EIA-858 ``Uranium Industry Annual Survey`` is shown in Appendix D. For the readers convenience, metric versions of selected tables from Chapters 1 and 2 are presented in Appendix E along with the standard conversion factors used. A glossary of technical terms is at the end of the report. 24 figs., 56 tabs.

  1. Annual Energy Outlook 2012

    Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]

    A n n u a l E n e r g y Ou t l o o k 2 0 1 2 For further information . . . The Annual Energy Outlook 2012 was prepared by the U.S. Energy Information Administration (EIA), under...

  2. NERSC Annual Report 2004

    SciTech Connect (OSTI)

    Hules, John; Bashor, Jon; Yarris, Lynn; McCullough, Julie; Preuss, Paul; Bethel, Wes

    2005-04-15T23:59:59.000Z

    The National Energy Research Scientific Computing Center (NERSC) is the premier computational resource for scientific research funded by the DOE Office of Science. The Annual Report includes summaries of recent significant and representative computational science projects conducted on NERSC systems as well as information about NERSC's current and planned systems and services.

  3. Trinity College Annual Fund

    E-Print Network [OSTI]

    Lasenby, Joan

    Trinity College Annual Fund 2014 #12;How did Trinity influence your future? By introducing Trinity the Trinity in Cambe programme. Working together, we expect Trin and IntoUniversity to make highe education, the likelihood of getting university and attitudes to learning" Trinity has a long history of nurturing

  4. 2014 Annual AFN Convention

    Broader source: Energy.gov [DOE]

    The AFN Convention is the largest representative annual gathering in the United States of any Native peoples. In addition to the memorable keynote speeches, the expert panels and special reports, the Convention features several evenings of cultural performances known as Quyana Alaska.

  5. Observable spectra of induced gravitational waves from inflation

    SciTech Connect (OSTI)

    Alabidi, Laila; Sasaki, Misao [Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan); Kohri, Kazunori [Cosmophysics Group, Theory Center, IPNS, KEK, Tsukuba 305-0801 (Japan); Sendouda, Yuuiti, E-mail: laila@yukawa.kyoto-u.ac.jp, E-mail: kohri@post.kek.jp, E-mail: misao@yukawa.kyoto-u.ac.jp, E-mail: sendouda@cc.hirosaki-u.ac.jp [Graduate School of Science and Technology, Hirosaki University, Hirosaki, Aomori 036-8561 (Japan)

    2012-09-01T23:59:59.000Z

    Measuring the primordial power spectrum on small scales is a powerful tool in inflation model building, yet constraints from Cosmic Microwave Background measurements alone are insufficient to place bounds stringent enough to be appreciably effective. For the very small scale spectrum, those which subtend angles of less than 0.3 degrees on the sky, an upper bound can be extracted from the astrophysical constraints on the possible production of primordial black holes in the early universe. A recently discovered observational by-product of an enhanced power spectrum on small scales, induced gravitational waves, have been shown to be within the range of proposed space based gravitational wave detectors; such as NASA's LISA and BBO detectors, and the Japanese DECIGO detector. In this paper we explore the impact such a detection would have on models of inflation known to lead to an enhanced power spectrum on small scales, namely the Hilltop-type and running mass models. We find that the Hilltop-type model can produce observable induced gravitational waves within the range of BBO and DECIGO for integral and fractional powers of the potential within a reasonable number of e?folds. We also find that the running mass model can produce a spectrum within the range of these detectors, but require that inflation terminates after an unreasonably small number of e?folds. Finally, we argue that if the thermal history of the Universe were to accomodate such a small number of e?folds the Running Mass Model can produce Primordial Black Holes within a mass range compatible with Dark Matter, i.e. within a mass range 10{sup 20}g?

  6. Towards general patterns of features in multi-field inflation

    E-Print Network [OSTI]

    Xian Gao; Jinn-Ouk Gong

    2015-06-29T23:59:59.000Z

    We investigate the consequences of general curved trajectories in multi-field inflation. After setting up a completely general formalism using the mass basis, which naturally accommodates the notion of light and heavy modes, we study in detail the simple case of two successive turns in two-field system. We find the power spectrum of the curvature perturbation receives corrections that exhibit oscillatory features sinusoidal in the logarithm of the comoving wavenumber without slow-roll suppression. We show that this is because of the resonance of the heavy modes inside and outside the mass horizon.

  7. On Brane Inflation Potentials and Black Hole Attractors

    E-Print Network [OSTI]

    Adil Belhaj; Pablo Diaz; Mohamed Naciri; Antonio Segui

    2007-11-16T23:59:59.000Z

    We propose a new potential in brane inflation theory, which is given by the arctangent of the square of the scalar field. Then we perform an explicit computation for inflationary quantities. This potential has many nice features. In the small field approximation, it reproduces the chaotic and MSSM potentials. It allows one, in the large field approximation, to implement the attractor mechanism for bulk black holes where the geometry on the brane is de Sitter. In particular, we show, up to some assumptions, that the Friedman equation can be reinterpreted as a Schwarzschild black hole attractor equation for its mass parameter.

  8. Quasiattractor in models of new and chaotic inflation

    E-Print Network [OSTI]

    V. V. Kiselev; S. A. Timofeev

    2009-05-27T23:59:59.000Z

    Inflation with a scalar-field potential of the form \\lambda (\\phi^2-v^2)^2 can be described in terms of a parametrical attractor with critical points, whose driftage depends on the control value of the slowly changing Hubble rate. The method allows us to easily obtain theoretical expressions for fluctuations of inhomogeneity in both the cosmic microwave background and distribution of matter. We find the region for admissible values of potential parameters, wherein theoretical predictions are consistent with experimental results within the limits of measurement uncertainties.

  9. Axions, strong and weak CP, and KNP inflation

    E-Print Network [OSTI]

    Kim, Jihn E

    2015-01-01T23:59:59.000Z

    I review the ideas leading to the QCD axion and also comment on the Jarlskog determinant describing the observed weak CP violation, and the axion-related Kim-Nilles-Peloso inflation. All of these use pseudoscalars, and the underlying principle is the discrete gauge symmetry either in the bottom-up or top-down approaches. Here, the effects of gravity are required to be unimportant in the low energy effective theory. String compactification is safe from the gravity spoil of global symmetries and some examples from string compactification are commented.

  10. Dilution of axion dark radiation by thermal inflation

    E-Print Network [OSTI]

    Hattori, Hironori; Omoto, Naoya; Seto, Osamu

    2015-01-01T23:59:59.000Z

    Axion in the Peccei-Quinn (PQ) mechanism provides a promising solution to the strong CP problem in the standard model of particle physics. Coherently generated PQ scalar fields could dominate the energy density in the early Universe and decay into relativistic axions, which would confront with the current dark radiation constraints. We study the possibility that a thermal inflation driven by a $U(1)$ gauged Higgs field dilutes such axions. A well motivated extra gauged $U(1)$ would be the local $B-L$ symmetry. We also discuss the implication for the case of $U(1)_{B-L}$ and available baryogenesis mechanism in such cosmology.

  11. Nonisotropy in the CMB power spectrum in single field inflation

    SciTech Connect (OSTI)

    Donoghue, John F. [Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003 (United States); Dutta, Koushik [Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003 (United States); Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut), Foehringer Ring 6, D-80805 Muenchen (Germany); Ross, Andreas [Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003 (United States); Department of Physics, Yale University, New Haven, Connecticut 06520 (United States)

    2009-07-15T23:59:59.000Z

    Contaldi et al.[C. R. Contaldi, M. Peloso, L. Kofman, and A. Linde, J. Cosmol. Astropart. Phys. 07 (2003) 002] have suggested that an initial period of kinetic energy domination in single field inflation may explain the lack of CMB power at large angular scales. We note that in this situation it is natural that there also be a spatial gradient in the initial value of the inflaton field, and that this can provide a spatial asymmetry in the observed CMB power spectrum, manifest at low values of l. We investigate the nature of this asymmetry and comment on its relation to possible anomalies at low l.

  12. Anisotropic inflation with non-abelian gauge kinetic function

    SciTech Connect (OSTI)

    Murata, Keiju [DAMTP, University of Cambridge, Centre for Mathematical Sciences, Wilberforce Road, Cambridge CB3 0WA (United Kingdom); Soda, Jiro, E-mail: K.Murata@damtp.cam.ac.uk, E-mail: jiro@tap.scphys.kyoto-u.ac.jp [Department of Physics, Kyoto University, Kyoto, 606-8502 (Japan)

    2011-06-01T23:59:59.000Z

    We study an anisotropic inflation model with a gauge kinetic function for a non-abelian gauge field. We find that, in contrast to abelian models, the anisotropy can be either a prolate or an oblate type, which could lead to a different prediction from abelian models for the statistical anisotropy in the power spectrum of cosmological fluctuations. During a reheating phase, we find chaotic behaviour of the non-abelian gauge field which is caused by the nonlinear self-coupling of the gauge field. We compute a Lyapunov exponent of the chaos which turns out to be uncorrelated with the anisotropy.

  13. Finding Regions of Interest on Toroidal Meshes

    SciTech Connect (OSTI)

    Wu, Kesheng; Sinha, Rishi R; Jones, Chad; Ethier, Stephane; Klasky, Scott; Ma, Kwan-Liu; Shoshani, Arie; Winslett, Marianne

    2011-02-09T23:59:59.000Z

    Fusion promises to provide clean and safe energy, and a considerable amount of research effort is underway to turn this aspiration intoreality. This work focuses on a building block for analyzing data produced from the simulation of microturbulence in magnetic confinementfusion devices: the task of efficiently extracting regions of interest. Like many other simulations where a large amount of data are produced,the careful study of ``interesting'' parts of the data is critical to gain understanding. In this paper, we present an efficient approach forfinding these regions of interest. Our approach takes full advantage of the underlying mesh structure in magnetic coordinates to produce acompact representation of the mesh points inside the regions and an efficient connected component labeling algorithm for constructingregions from points. This approach scales linearly with the surface area of the regions of interest instead of the volume as shown with bothcomputational complexity analysis and experimental measurements. Furthermore, this new approach is 100s of times faster than a recentlypublished method based on Cartesian coordinates.

  14. Processing Personal Health Data in Legitimate Interest

    E-Print Network [OSTI]

    Alexin, Zoltán

    : excluding data from the National Health Insurance Fund database related to unsubsidized care events, medical diagnosis, the provision of care or treatment or the management of health-care services, and whereProcessing Personal Health Data in Legitimate Interest ,,Infocommunication technologies

  15. Hydropower Potential Scoping Study Gauging Interest

    E-Print Network [OSTI]

    6/19/2013 1 Hydropower Potential Scoping Study ­ Gauging Interest Generating Resources Advisory and associated technologies. ­ Hydropower upgrades, new hydropower projects 2 Purpose Develop a hydro supply curve to determine the hydropower development potential in the NW region ­ Council's Seventh Power Plan

  16. Blue Tensor Spectrum from Particle Production during Inflation

    E-Print Network [OSTI]

    Shinji Mukohyama; Ryo Namba; Marco Peloso; Gary Shiu

    2014-07-25T23:59:59.000Z

    We discuss a mechanism of particle production during inflation that can result in a blue gravitational wave (GW) spectrum, compatible with the BICEP2 result and with the r < 0.11 limit on the tensor-to-scalar ratio at the Planck pivot scale. The mechanism is based on the production of vector quanta from a rolling pseudo-scalar field. Both the vector and the pseudo-scalar are only gravitationally coupled to the inflaton, to keep the production of inflaton quanta at an unobservable level (the overproduction of non-gaussian scalar perturbations is a generic difficulty for mechanisms that aim to generate a visible GW signal from particle production during inflation). This mechanism can produce a detectable amount of GWs for any inflationary energy scale. The produced GWs are chiral and non-gaussian; both these aspects can be tested with large-scale polarization data (starting from Planck). We study how to reconstruct the pseudo-scalar potential from the GW spectrum.

  17. Graceful Exit Inflation in $f(T)$ Gravity

    E-Print Network [OSTI]

    G. G. L. Nashed; W. El Hanafy; Sh. Kh. Ibrahim

    2015-04-04T23:59:59.000Z

    We apply a quadratic teleparallel torsion scalar of the $f(T)=T+\\alpha T^{2}$ field equations to the spatially flat Friedmann-Robertson-Walker (FRW) model. We assume two perfect fluid components, the matter component has a fixed equation of state (EoS) parameter $\\omega$, while the torsion component has a dynamical EoS. We obtain an effective scale factor allowing a graceful exit inflation model with no need to slow roll technique. We perform a standard cosmological study to examine the cosmic evolution. In addition, the effective EoS shows consistent results confirming a smooth phase transition from inflation to radiation dominant universe. We consider the case when the torsion is made of a scalar field. This treatment enables us to induce a scalar field sensitive to the spacetime symmetry with an effective potential constructed from the quadratic $f(T)$ gravity. The model is parameterized by two parameters ($\\alpha,\\omega$) both derive the universe to exit out of de Sitter expansion. The first is purely gravitational and works effectively at large Hubble regime of the early stage allowing a slow roll potential. The second parameter $\\omega$ is a thermal-like correction coupled to the kinetic term and works effectively at low Hubble regime of late stages. The slow roll analysis of the obtained potential can perform tensor-to-scalar ratio and spectral index parameters consistent with the recent Planck and BICEP2 data. Both cosmological and scalar field analyses show consistent results.

  18. Studies of inflation and dark energy with coupled scalar fields

    E-Print Network [OSTI]

    Vu, Susan

    2015-01-01T23:59:59.000Z

    Currently there is no definitive description for the accelerated expansion of the Universe at both early and late times; we know these two periods as the epochs of inflation and dark energy. Contained within this Thesis are two studies of inflation and one in the context of dark energy. The first study involves two noncanonical kinetic terms each in a two-field scenario, and their effects on the generation of isocurvature modes. As a result, these terms affect the isocurvature perturbations produced, and consequently the Cosmic Microwave Background. In the following study, the impact of a sharp transition upon the effective Planck mass is considered in both a single-field and two-field model. A feature in the primordial power spectrum arising from these transitions is found in single-field models, but not for two-field models. The final model discussed is on the subject of dark energy. A type of nonconformal coupling is examined namely the "disformal" coupling; in this scenario a scalar field is disformally c...

  19. Non-minimal Higgs inflation and frame dependence in cosmology

    SciTech Connect (OSTI)

    Steinwachs, Christian F. [School of Mathematical Sciences, University of Nottingham University Park, Nottingham, NG7 2RD (United Kingdom); Kamenshchik, Alexander Yu. [Dipartimento di Fisica e Astronomia and INFN, Via Irnerio 46, 40126 Bologna, Italy and L.D. Landau Institute for Theoretical Physics of the Russian Academy of Sciences, Kosygin str. 2, 119334 Moscow (Russian Federation)

    2013-02-21T23:59:59.000Z

    We investigate a very general class of cosmological models with scalar fields non-minimally coupled to gravity. A particular representative in this class is given by the non-minimal Higgs inflation model in which the Standard Model Higgs boson and the inflaton are described by one and the same scalar particle. While the predictions of the non-minimal Higgs inflation scenario come numerically remarkably close to the recently discovered mass of the Higgs boson, there remains a conceptual problem in this model that is associated with the choice of the cosmological frame. While the classical theory is independent of this choice, we find by an explicit calculation that already the first quantum corrections induce a frame dependence. We give a geometrical explanation of this frame dependence by embedding it into a more general field theoretical context. From this analysis, some conceptional points in the long lasting cosmological debate: 'Jordan frame vs. Einstein frame' become more transparent and in principle can be resolved in a natural way.

  20. Gauge-preheating and the end of axion inflation

    E-Print Network [OSTI]

    Adshead, Peter; Scully, Timothy R; Sfakianakis, Evangelos I

    2015-01-01T23:59:59.000Z

    We study the onset of the reheating epoch at the end of axion-driven inflation where the axion is coupled to an Abelian, $U(1)$, gauge field via a Chern-Simons interaction term. We focus primarily on $m^2\\phi^2$ inflation and explore the possibility that preheating can occur for a range of coupling values consistent with recent observations and bounds on the overproduction of primordial black holes. We find that for a wide range of parameters preheating is efficient. In certain cases the inflaton is seen to transfer all its energy to the gauge fields within a few oscillations. We find that the gauge fields on sub-horizon scales end in an unpolarized state, due to the existence of strong rescattering between the inflaton and gauge modes. We also present a preliminary study of an axion monodromy model coupled to $U(1)$ gauge fields, seeing a similarly efficient preheating behavior as well as indications that the coupling strength has an effect on the creation of oscillons.

  1. Inflation and the scale dependent spectral index: prospects and strategies

    SciTech Connect (OSTI)

    Adshead, Peter; Easther, Richard [Department of Physics, Yale University, 217 Prospect Street, New Haven CT 06520 (United States); Pritchard, Jonathan; Loeb, Abraham, E-mail: adshead@kicp.uchicago.edu, E-mail: richard.easther@yale.edu, E-mail: jpritchard@cfa.harvard.edu, E-mail: aloeb@cfa.harvard.edu [Harvard-Smithsonian Center for Astrophysics, MS-51, 60 Garden St, Cambridge, MA 02138 (United States)

    2011-02-01T23:59:59.000Z

    We consider the running of the spectral index as a probe of both inflation itself, and of the overall evolution of the very early universe. Surveying a collection of simple single field inflationary models, we confirm that the magnitude of the running is relatively consistent, unlike the tensor amplitude, which varies by orders of magnitude. Given this target, we confirm that the running is potentially detectable by future large scale structure or 21 cm observations, but that only the most futuristic measurements can distinguish between these models on the basis of their running. For any specified inflationary scenario, the combination of the running index and unknown post-inflationary expansion history induces a theoretical uncertainty in the predicted value of the spectral index. This effect can easily dominate the statistical uncertainty with which Planck and its successors are expected to measure the spectral index. More positively, upcoming cosmological experiments thus provide an intriguing probe of physics between TeV and GUT scales by constraining the reheating history associated with any specified inflationary model, opening a window into the ''primordial dark age'' that follows the end of inflation.

  2. Higgs Inflation, Seesaw Physics and Fermion Dark Matter

    E-Print Network [OSTI]

    Nobuchika Okada; Qaisar Shafi

    2015-01-22T23:59:59.000Z

    We present an inflationary model in which the Standard Model Higgs doublet field with non-minimal coupling to gravity drives inflation, and the effective Higgs potential is stabilized by new physics which includes a dark matter particle and right-handed neutrinos for the seesaw mechanism. All of the new particles are fermions, so that the Higgs doublet is the unique inflaton candidate. With central values for the masses of the top quark and the Higgs boson, the renormalization group improved Higgs potential is employed to yield the scalar spectral index $n_s \\simeq 0.968$, the tensor-to-scalar ratio $r \\simeq 0.003$, and the running of the spectral index $\\alpha=dn_s/d \\ln k \\simeq -5.2 \\times 10^{-4}$ for the number of e-folds $N_0=60$ ($n_s \\simeq 0.962$, $r \\simeq 0.004$, and $\\alpha \\simeq -7.5 \\times 10^{-4}$ for $N_0=50$). The fairly low value of $r \\simeq 0.003$ predicted in this class of models means that the ongoing space and land based experiments are not expected to observe gravity waves generated during inflation. [Dedicated to the memory of Dr. Paul Weber (1947 - 2015). Paul was an exceptional human being and a very special friend who will be sorely missed.

  3. Formalising the Slow-Roll Approximation in Inflation

    E-Print Network [OSTI]

    Andrew R. Liddle; Paul Parsons; John D. Barrow

    1994-08-04T23:59:59.000Z

    The meaning of the inflationary slow-roll approximation is formalised. Comparisons are made between an approach based on the Hamilton-Jacobi equations, governing the evolution of the Hubble parameter, and the usual scenario based on the evolution of the potential energy density. The vital role of the inflationary attractor solution is emphasised, and some of its properties described. We propose a new measure of inflation, based upon contraction of the comoving Hubble length as opposed to the usual e-foldings of physical expansion, and derive relevant formulae. We introduce an infinite hierarchy of slow-roll parameters, and show that only a finite number of them are required to produce results to a given order. The extension of the slow-roll approximation into an analytic slow-roll expansion, converging on the exact solution, is provided. Its role in calculations of inflationary dynamics is discussed. We explore rational-approximants as a method of extending the range of convergence of the slow-roll expansion up to, and beyond, the end of inflation.

  4. Perturbations of Single-field Inflation in Modified Gravity Theory

    E-Print Network [OSTI]

    Taotao Qiu; Jun-Qing Xia

    2015-04-12T23:59:59.000Z

    In this paper, we study the case of single field inflation within the framework of modified gravity theory where the gravity part has an arbitrary form $f(R)$. Via a conformal transformation, this case can be transformed into its Einstein frame where it looks like a two-field inflation model. However, due to the existence of the isocurvature modes in such a multi-degree-of-freedom (m.d.o.f.) system, the (curvature) perturbations are not equivalent in two frames, so in despite of its convenience, it is illegal to treat the perturbations in its Einstein frame as the "real" ones as we always do for pure $f(R)$ theory or single field with nonminimal coupling. Here by pulling the results of curvature perturbations back into its original Jordan frame, we show explicitly the power spectrum and spectral index of the perturbations in the Jordan frame, as well as how it differs from the Einstein frame. We also fit our results with the newest Planck data. Since there are large parameter space in these models, we show that it is easy to fit the data very well.

  5. Perturbations of Single-field Inflation in Modified Gravity Theory

    E-Print Network [OSTI]

    Qiu, Taotao

    2015-01-01T23:59:59.000Z

    In this paper, we study the case of single field inflation within the framework of modified gravity theory where the gravity part has an arbitrary form $f(R)$. Via a conformal transformation, this case can be transformed into its Einstein frame where it looks like a two-field inflation model. However, due to the existence of the isocurvature modes in such a multi-degree-of-freedom (m.d.o.f.) system, the perturbations are not equivalent in two frames, so in despite of its convenience, it is illegal to treat the perturbations in its Einstein frame as the "real" ones as we always do for pure $f(R)$ theory or single field with nonminiaml coupling, and one should pull them back into its original Jordan frame. In this paper, we calculate the perturbations in such a case in its Jordan frame. We also fit our results with the newest Planck data. Since there are large parameter space in these models, we show that it is easy to fit the data very well.

  6. Hot-Jupiter Inflation due to Deep Energy Deposition

    E-Print Network [OSTI]

    Ginzburg, Sivan

    2015-01-01T23:59:59.000Z

    Some extrasolar giant planets in close orbits---"hot Jupiters"---exhibit larger radii than that of a passively cooling planet. The extreme irradiation $L_{\\rm eq}$ these hot Jupiters receive from their close in stars creates a thick isothermal layer in their envelopes, which slows down their convective cooling, allowing them to retain their inflated size for longer. This is yet insufficient to explain the observed sizes of the most inflated planets. Some models invoke an additional power source, deposited deep in the planet's envelope. Here we present an analytical model for the cooling of such irradiated, and internally heated gas giants. We show that a power source $L_{\\rm dep}$, deposited at an optical depth $\\tau_{\\rm dep}$, creates an exterior convective region, between optical depths $L_{\\rm eq}/L_{\\rm dep}$ and $\\tau_{\\rm dep}$, beyond which a thicker isothermal layer exists, which in extreme cases may extend to the center of the planet. This convective layer, which occurs only for $L_{\\rm dep}\\tau_{\\r...

  7. Renewable energy annual 1995

    SciTech Connect (OSTI)

    NONE

    1995-12-01T23:59:59.000Z

    The Renewable Energy Annual 1995 is the first in an expected series of annual reports the Energy Information Administration (EIA) intends to publish to provide a comprehensive assessment of renewable energy. This report presents the following information on the history, status, and prospects of renewable energy data: estimates of renewable resources; characterizations of renewable energy technologies; descriptions of industry infrastructures for individual technologies; evaluations of current market status; and assessments of near-term prospects for market growth. An international section is included, as well as two feature articles that discuss issues of importance for renewable energy as a whole. The report also contains a number of technical appendices and a glossary. The renewable energy sources included are biomass (wood), municipal solid waste, biomass-derived liquid fuels, geothermal, wind, and solar and photovoltaic.

  8. Coal industry annual 1997

    SciTech Connect (OSTI)

    NONE

    1998-12-01T23:59:59.000Z

    Coal Industry Annual 1997 provides comprehensive information about US coal production, number of mines, prices, productivity, employment, productive capacity, and recoverable reserves. US Coal production for 1997 and previous years is based on the annual survey EIA-7A, Coal Production Report. This report presents data on coal consumption, coal distribution, coal stocks, coal prices, and coal quality for Congress, Federal and State agencies, the coal industry, and the general public. Appendix A contains a compilation of coal statistics for the major coal-producing States. This report includes a national total coal consumption for nonutility power producers that are not in the manufacturing, agriculture, mining, construction, or commercial sectors. 14 figs., 145 tabs.

  9. Petroleum marketing annual 1994

    SciTech Connect (OSTI)

    NONE

    1995-08-24T23:59:59.000Z

    The Petroleum Marketing Annual (PMA) provides information and statistical data on a variety of crude oils and refined petroleum products. The publication presents statistics on crude oil costs and refined petroleum products sales for use by industry, government, private sector analysis, educational institutions, and consumers. Data on crude oil include the domestic first purchase price, the fob and landed cost of imported crude oil, and the refiners` acquisition cost of crude oil. Refined petroleum product sales data include motor gasoline, distillates, residuals, aviation fuels, kerosene, and propane. The Petroleum Marketing Division, Office of Oil and Gas, Energy Information Administration ensures the accuracy, quality, and confidentiality of the published data in the Petroleum Marketing Annual. For this production, all estimates have been recalculated since their earlier publication in the Petroleum Marketing Monthly (PMM). These calculations made use of additional data and corrections that were received after the PMM publication date.

  10. Vehicle for carrying an object of interest

    DOE Patents [OSTI]

    Zollinger, W.T.; Ferrante, T.A.

    1998-10-13T23:59:59.000Z

    A vehicle for carrying an object of interest across a supporting surface including a frame having opposite first and second ends; a first pair of wheels fixedly mounted on the first end of the frame; a second pair of wheels pivotally mounted on the second end of the frame; and a pair of motors borne by the frame, each motor disposed in driving relation relative to one of the pairs of wheels, the motors propelling the vehicle across the supporting surface. 8 figs.

  11. Vehicle for carrying an object of interest

    DOE Patents [OSTI]

    Zollinger, W. Thor (Idaho Falls, ID); Ferrante, Todd A. (Westerville, OH)

    1998-01-01T23:59:59.000Z

    A vehicle for carrying an object of interest across a supporting surface including a frame having opposite first and second ends; a first pair of wheels fixedly mounted on the first end of the frame; a second pair of wheels pivotally mounted on the second end of the frame; and a pair of motors borne by the frame, each motor disposed in driving relation relative to one of the pairs of wheels, the motors propelling the vehicle across the supporting surface.

  12. Uranium industry annual 1995

    SciTech Connect (OSTI)

    NONE

    1996-05-01T23:59:59.000Z

    The Uranium Industry Annual 1995 (UIA 1995) provides current statistical data on the U.S. uranium industry`s activities relating to uranium raw materials and uranium marketing. The UIA 1995 is prepared for use by the Congress, Federal and State agencies, the uranium and nuclear electric utility industries, and the public. It contains data for the period 1986 through 2005 as collected on the Form EIA-858, ``Uranium Industry Annual Survey``. Data collected on the ``Uranium Industry Annual Survey`` provide a comprehensive statistical characterization of the industry`s plans and commitments for the near-term future. Where aggregate data are presented in the UIA 1995, care has been taken to protect the confidentiality of company-specific information while still conveying accurate and complete statistical data. Data on uranium raw materials activities for 1986 through 1995 including exploration activities and expenditures, EIA-estimated reserves, mine production of uranium, production of uranium concentrate, and industry employment are presented in Chapter 1. Data on uranium marketing activities for 1994 through 2005, including purchases of uranium and enrichment services, enrichment feed deliveries, uranium fuel assemblies, filled and unfilled market requirements, uranium imports and exports, and uranium inventories are shown in Chapter 2. The methodology used in the 1995 survey, including data edit and analysis, is described in Appendix A. The methodologies for estimation of resources and reserves are described in Appendix B. A list of respondents to the ``Uranium Industry Annual Survey`` is provided in Appendix C. For the reader`s convenience, metric versions of selected tables from Chapters 1 and 2 are presented in Appendix D along with the standard conversion factors used. A glossary of technical terms is at the end of the report. 14 figs., 56 tabs.

  13. NERSC 2001 Annual Report

    SciTech Connect (OSTI)

    Hules, John (editor)

    2001-12-12T23:59:59.000Z

    The National Energy Research Scientific Computing Center (NERSC) is the primary computational resource for scientific research funded by the DOE Office of Science. The Annual Report for FY2001 includes a summary of recent computational science conducted on NERSC systems (with abstracts of significant and representative projects); information about NERSC's current systems and services; descriptions of Berkeley Lab's current research and development projects in applied mathematics, computer science, and computational science; and a brief summary of NERSC's Strategic Plan for 2002-2005.

  14. NERSC 1998 annual report

    SciTech Connect (OSTI)

    Hules, John (ed.)

    1999-03-01T23:59:59.000Z

    This 1998 annual report from the National Scientific Energy Research Computing Center (NERSC) presents the year in review of the following categories: Computational Science; Computer Science and Applied Mathematics; and Systems and Services. Also presented are science highlights in the following categories: Basic Energy Sciences; Biological and Environmental Research; Fusion Energy Sciences; High Energy and Nuclear Physics; and Advanced Scientific Computing Research and Other Projects.

  15. Uranium industry annual 1994

    SciTech Connect (OSTI)

    NONE

    1995-07-05T23:59:59.000Z

    The Uranium Industry Annual 1994 (UIA 1994) provides current statistical data on the US uranium industry`s activities relating to uranium raw materials and uranium marketing during that survey year. The UIA 1994 is prepared for use by the Congress, Federal and State agencies, the uranium and nuclear electric utility industries, and the public. It contains data for the 10-year period 1985 through 1994 as collected on the Form EIA-858, ``Uranium Industry Annual Survey.`` Data collected on the ``Uranium Industry Annual Survey`` (UIAS) provide a comprehensive statistical characterization of the industry`s activities for the survey year and also include some information about industry`s plans and commitments for the near-term future. Where aggregate data are presented in the UIA 1994, care has been taken to protect the confidentiality of company-specific information while still conveying accurate and complete statistical data. A feature article, ``Comparison of Uranium Mill Tailings Reclamation in the United States and Canada,`` is included in the UIA 1994. Data on uranium raw materials activities including exploration activities and expenditures, EIA-estimated resources and reserves, mine production of uranium, production of uranium concentrate, and industry employment are presented in Chapter 1. Data on uranium marketing activities, including purchases of uranium and enrichment services, and uranium inventories, enrichment feed deliveries (actual and projected), and unfilled market requirements are shown in Chapter 2.

  16. annual implementation work: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    ... 38 Foundations' Support and Financial Information 97 2013 Annual Report | 1 2013 ANNUAL REPORT Mathematics Websites Summary: 2013 Annual Report |...

  17. Estimation of Inflation parameters for Perturbed Power Law model using recent CMB measurements

    E-Print Network [OSTI]

    Suvodip Mukherjee; Santanu Das; Minu Joy; Tarun Souradeep

    2015-01-31T23:59:59.000Z

    Cosmic Microwave Background (CMB) is an important probe for understanding the inflationary era of the Universe. We consider the Perturbed Power Law (PPL) model of inflation which is a soft deviation from Power Law (PL) inflationary model. This model captures the effect of higher order derivative of Hubble parameter during inflation, which in turn leads to a non-zero effective mass $m_{\\rm eff}$ for the inflaton field. The higher order derivatives of Hubble parameter at leading order sources constant difference in the spectral index for scalar and tensor perturbation going beyond PL model of inflation. PPL model have two observable independent parameters, namely spectral index for tensor perturbation $\

  18. Estimation of Inflation parameters for Perturbed Power Law model using recent CMB measurements

    E-Print Network [OSTI]

    Mukherjee, Suvodip; Joy, Minu; Souradeep, Tarun

    2014-01-01T23:59:59.000Z

    Cosmic Microwave Background (CMB) is an important probe for understanding the inflationary era of the Universe. We consider the Perturbed Power Law (PPL) model of inflation which is a soft deviation from Power Law (PL) inflationary model. This model captures the effect of higher order derivative of Hubble parameter during inflation, which in turn leads to a non-zero effective mass $m_{\\rm eff}$ for the inflaton field. The higher order derivatives of Hubble parameter at leading order sources constant difference in the spectral index for scalar and tensor perturbation going beyond PL model of inflation. PPL model have two observable independent parameters, namely spectral index for tensor perturbation $\

  19. Utility Wind Interest Group | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere IRaghuraji Agro IndustriesTown of Ladoga,planning methodologies and toolsoperationWind Interest Group Place:

  20. CANCER PROGRAM ANNUAL REPORT CANCER PROGRAM

    E-Print Network [OSTI]

    Illinois at Chicago, University of

    CANCER PROGRAM ANNUAL REPORT CANCER PROGRAM 2010 ANNUAL REPORT WITH STATISTICAL DATA FROM 2009 UNIVERSITY OF ILLINOIS MEDICAL CENTER #12;2 CANCER PROGRAM ANNUAL REPORT 2 #12;3 CANCER PROGRAM ANNUAL REPORT 3 UIMC CANCER PROGRAM CHANGING MULTIDISCIPLINARY CARE. FOR GOOD. #12;4 CANCER PROGRAM ANNUAL REPORT

  1. Chemical and biological nonproliferation program. FY99 annual report

    SciTech Connect (OSTI)

    NONE

    2000-03-01T23:59:59.000Z

    This document is the first of what will become an annual report documenting the progress made by the Chemical and Biological Nonproliferation Program (CBNP). It is intended to be a summary of the program's activities that will be of interest to both policy and technical audiences. This report and the annual CBNP Summer Review Meeting are important vehicles for communication with the broader chemical and biological defense and nonproliferation communities. The Chemical and Biological Nonproliferation Program Strategic Plan is also available and provides additional detail on the program's context and goals. The body of the report consists of an overview of the program's philosophy, goals and recent progress in the major program areas. In addition, an appendix is provided with more detailed project summaries that will be of interest to the technical community.

  2. Historical Natural Gas Annual 1999

    U.S. Energy Information Administration (EIA) Indexed Site

    1999 The Historical Natural Gas Annual contains historical information on supply and disposition of natural gas at the national, regional, and State level as well as prices at...

  3. 2006 Annual Report: Discovering Solutions

    SciTech Connect (OSTI)

    none,

    2006-01-01T23:59:59.000Z

    This annual report includes: a brief overview of Western; FY 2006 highlights; FY 2006 Integrated Resource Planning, or IRP, summary; and financial data.

  4. Tanana Chiefs Conference Annual Convention

    Broader source: Energy.gov [DOE]

    The Tanana Chiefs Conference is holding its annual convention to discuss issues in the region, hold elections, and adopt resolutions presented by Tribes.

  5. Inflation scenario via the Standard Model Higgs boson and LHC

    E-Print Network [OSTI]

    A. O. Barvinsky; A. Yu. Kamenshchik; A. A. Starobinsky

    2008-09-11T23:59:59.000Z

    We consider a quantum corrected inflation scenario driven by a generic GUT or Standard Model type particle model whose scalar field playing the role of an inflaton has a strong non-minimal coupling to gravity. We show that currently widely accepted bounds on the Higgs mass falsify the suggestion of the paper arXiv:0710.3755 (where the role of radiative corrections was underestimated) that the Standard Model Higgs boson can serve as the inflaton. However, if the Higgs mass could be raised to $\\sim 230$ GeV, then the Standard Model could generate an inflationary scenario with the spectral index of the primordial perturbation spectrum $n_s\\simeq 0.935$ (barely matching present observational data) and the very low tensor-to-scalar perturbation ratio $r\\simeq 0.0006$.

  6. Inflation with a Planck-scale frequency cutoff

    E-Print Network [OSTI]

    J. C. Niemeyer

    2000-11-22T23:59:59.000Z

    The implementation of a Planck-scale high frequency and short wavelength cutoff in quantum theories on expanding backgrounds may have potentially nontrivial implications, such as the breaking of local Lorentz invariance and the existence of a yet unknown mechanism for the creation of vacuum modes. In scenarios where inflation begins close to the cutoff scale, these effects could have observable consequences as trans-Planckian modes are redshifted to cosmological scales. In close analogy with similar studies of Hawking radiation, a simple theory of a minimally coupled scalar field in de Sitter space is studied, with a high frequency cutoff imposed by a nonlinear dispersion relation. Under certain conditions the model predicts deviations from the standard inflationary scenario. We also comment on the difficulties in generalizing fluid models of Hawking radiation to cosmological space-times.

  7. Constraints on Axion Inflation from the Weak Gravity Conjecture

    E-Print Network [OSTI]

    Rudelius, Tom

    2015-01-01T23:59:59.000Z

    We derive constraints facing models of axion inflation based on decay constant alignment from a string-theoretic and quantum gravitational perspective. In particular, we investigate the prospects for alignment and `anti-alignment' of $C_4$ axion decay constants in type IIB string theory, deriving a strict no-go result in the latter case. We discuss the relationship of axion decay constants to the weak gravity conjecture and demonstrate agreement between our string-theoretic constraints and those coming from the `generalized' weak gravity conjecture. Finally, we consider a particular model of decay constant alignment in which the potential of $C_4$ axions in type IIB compactifications on a Calabi-Yau three-fold is dominated by contributions from $D7$-branes, pointing out that this model evades some of the challenges derived earlier in our paper but is highly constrained by other geometric considerations.

  8. Symmetry Breaking and False Vacuum Decay after Hybrid Inflation

    E-Print Network [OSTI]

    Juan Garcia-Bellido; Margarita Garcia Perez; Antonio Gonzalez-Arroyo

    2003-03-25T23:59:59.000Z

    We discuss the onset of symmetry breaking from the false vacuum in generic scenarios in which the mass squared of the symmetry breaking (Higgs) field depends linearly with time, as it occurs, via the evolution of the inflaton, in models of hybrid inflation. We show that the Higgs fluctuations evolve from quantum to classical during the initial stages. This justifies the subsequent use of real-time lattice simulations to describe the fully non-perturbative and non-linear process of symmetry breaking. The early distribution of the Higgs field is that of a smooth classical gaussian random field, and consists of lumps whose shape and distribution is well understood analytically. The lumps grow with time and develop into ``bubbles'' which eventually collide among themselves, thus populating the high momentum modes, in their way towards thermalization at the true vacuum. With the help of some approximations we are able to provide a quasi-analytic understanding of this process.

  9. Running-mass inflation model and primordial black holes

    SciTech Connect (OSTI)

    Drees, Manuel; Erfani, Encieh, E-mail: drees@th.physik.uni-bonn.de, E-mail: erfani@th.physik.uni-bonn.de [Physikalisches Institut and Bethe Center for Theoretical Physics, Universität Bonn, Nussallee 12, 53115 Bonn (Germany)

    2011-04-01T23:59:59.000Z

    We revisit the question whether the running-mass inflation model allows the formation of Primordial Black Holes (PBHs) that are sufficiently long-lived to serve as candidates for Dark Matter. We incorporate recent cosmological data, including the WMAP 7-year results. Moreover, we include ''the running of the running'' of the spectral index of the power spectrum, as well as the renormalization group ''running of the running'' of the inflaton mass term. Our analysis indicates that formation of sufficiently heavy, and hence long-lived, PBHs still remains possible in this scenario. As a by-product, we show that the additional term in the inflaton potential still does not allow significant negative running of the spectral index.

  10. Signs of Analyticity in Single-Field Inflation

    E-Print Network [OSTI]

    Baumann, Daniel; Lee, Hayden; Porto, Rafael A

    2015-01-01T23:59:59.000Z

    The analyticity of response functions and scattering amplitudes implies powerful relations between low-energy observables and the underlying short-distance dynamics. These 'IR/UV' relations are rooted in basic physical principles, such as causality and unitarity. In this paper, we seek similar connections in inflation, relating cosmological observations to the physics responsible for the accelerated expansion. We assume that the inflationary theory is Lorentz invariant at short distances, but allow for non-relativistic interactions and a non-trivial speed of propagation at low energies. Focusing on forward scattering, we derive a 'sum rule' which equates a combination of low-energy parameters to an integral which is sensitive to the high-energy behavior of the theory. While for relativistic amplitudes unitarity is sufficient to prove positivity of the sum rule, this is not guaranteed in the non-relativistic case. We discuss the conditions under which positivity still applies, and show that they are satisfied ...

  11. Renewable energy annual 1996

    SciTech Connect (OSTI)

    NONE

    1997-03-01T23:59:59.000Z

    This report presents summary data on renewable energy consumption, the status of each of the primary renewable technologies, a profile of each of the associated industries, an analysis of topical issues related to renewable energy, and information on renewable energy projects worldwide. It is the second in a series of annual reports on renewable energy. The renewable energy resources included in the report are biomass (wood and ethanol); municipal solid waste, including waste-to-energy and landfill gas; geothermal; wind; and solar energy, including solar thermal and photovoltaic. The report also includes various appendices and a glossary.

  12. NPL 1999 Annual Report

    SciTech Connect (OSTI)

    None

    2000-01-01T23:59:59.000Z

    OAK-B135 NPL 1999 Annual Report. The Nuclear Physics Laboratory at the University of Washington in Seattle pursues a broad program of nuclear physics research. Research activities are conducted locally and at remote sites. The current program includes ''in-house'' research on nuclear collisions using the local tandem Van de Graaff and superconducting linac accelerators as well as local and remote non-accelerator research on fundamental symmetries and weak interactions and user-mode research on relativistic heavy ions at large accelerator facilities around the world.

  13. International energy annual 1995

    SciTech Connect (OSTI)

    NONE

    1996-12-01T23:59:59.000Z

    The International Energy Annual presents information and trends on world energy production and consumption for petroleum, natural gas, coal, and electricity. Production and consumption data are reported in standard units as well as British thermal units (Btu). Trade and reserves are shown for petroleum, natural gas, and coal. Data are provided on crude oil refining capacity and electricity installed capacity by type. Prices are included for selected crude oils and for refined petroleum products in selected countries. Population and Gross Domestic Product data are also provided.

  14. Annual Energy Review 2010

    SciTech Connect (OSTI)

    None

    2011-10-01T23:59:59.000Z

    This twenty-ninth edition of the Annual Energy Review (AER) presents the U.S. Energy Information Administration’s (EIA) most comprehensive look at integrated energy statistics. The summary statistics on the Nation’s energy production, consumption, trade, stocks, and prices cover all major energy commodities and all energy-consuming sectors of the U.S. economy from 1949 through 2010. The AER is EIA’s historical record of energy statistics and, because the coverage spans six decades, the statistics in this report are well-suited to long-term trend analysis.

  15. Annual Coal Report 2013

    Gasoline and Diesel Fuel Update (EIA)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for On-Highway4,1,50022,3,,,,6,1,9,1,50022,3,,,,6,1,Decade Year-0E (2001)gasoline prices4 OilU.S. OffshoreOilAnnual Coal Report

  16. Annual Energy Outlook 2015

    Gasoline and Diesel Fuel Update (EIA)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for On-Highway4,1,50022,3,,,,6,1,9,1,50022,3,,,,6,1,Decade Year-0E (2001)gasoline prices4 OilU.S. OffshoreOilAnnual38 Reference

  17. Annual Reports - Hanford Site

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office511041cloth DocumentationProductsAlternative FuelsSanta3 Table 3.EnergyAug412 ArchiveAnnual Reports

  18. 2007 TEPP Annual Report

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011 Strategic2UraniumEnergy CityDepartment ofNuclear| Department7 Annual Plan 2007 U.S.

  19. Annual Report on U

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011AT&T, Inc.'s Reply Comments AT&T,FACT SAmesEnergyAnnual PlanningAUGUST 2014

  20. Annual Site Environmental Report

    Office of Environmental Management (EM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011AT&T, Inc.'s Reply Comments AT&T,FACT SAmesEnergyAnnual PlanningAUGUST

  1. NERSC Annual Reports

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Saleshttp://www.fnal.gov/directorate/nalcal/nalcal02_07_05_files/nalcal.gif Directorate - Events - FermilabEnergyNERSC Annual

  2. Annual Reports - SRSCRO

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItem NotEnergy,ARMForms About BecomeTechnologiesVehicle PartsAnnual Energy Outlook

  3. ARM - Annual Reports

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOnItemResearchSOLICITATIONIMODI FICATION OFMaterialsAnnual Reports Publications Journal

  4. 2013 NUFO Annual Meeting

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of ScienceandMesa del(ANL-IN-03-032) -Less isNFebruary 2004AugustApril 20133 Audit2013 NUFO Annual

  5. Annual Report 2008.doc

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisiting the TWP TWPAlumni Alumni PARC/I-CARESAnalysis for NationalTotalAnnualSRS Cold

  6. NERSC Annual Reports

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |IsLove Your1Allocations NERSC Allocations: forNERSC AnnouncesAnnual

  7. Chaotic inflation from nonlinear sigma models in supergravity

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Hellerman, Simeon; Kehayias, John; Yanagida, Tsutomu T.

    2015-03-01T23:59:59.000Z

    We present a common solution to the puzzles of the light Higgs or quark masses and the need for a shift symmetry and large field values in high scale chaotic inflation. One way to protect, for example, the Higgs from a large supersymmetric mass term is if it is the Nambu–Goldstone boson (NGB) of a nonlinear sigma model. However, it is well known that nonlinear sigma models (NLSMs) with nontrivial Kähler transformations are problematic to couple to supergravity. An additional field is necessary to make the Kähler potential of the NLSM invariant in supergravity. This field must have a shiftmore »symmetry — making it a candidate for the inflaton (or axion). We give an explicit example of such a model for the coset space SU(3)/SU(2) × U(1), with the Higgs as the NGB, including breaking the inflaton’s shift symmetry and producing a chaotic inflation potential. This construction can also be applied to other models, such as one based on E?/SO(10) × U(1) × U(1) which incorporates the first two generations of (light) quarks as the Nambu–Goldstone multiplets, and has an axion in addition to the inflaton. Along the way we clarify and connect previous work on understanding NLSMs in supergravity and the origin of the extra field (which is the inflaton here), including a connection to Witten–Bagger quantization. This framework has wide applications to model building; a light particle from a NLSM requires, in supergravity, exactly the structure for chaotic inflaton or an axion« less

  8. Interest Management in Distributed Simulation: A Survey* Bora I. Kumova

    E-Print Network [OSTI]

    Kumova, Bora

    Interest Management in Distributed Simulation: A Survey* Bora I. Kumova Dokuz Eylul University Management; Distributed Simulation Abstract Current interest management implementations can reduce the data clustering. Furthermore, a new taxonomy for interest management that includes these concepts is introduced

  9. Shifting Interest Regimes of the Working Classes in Latin America

    E-Print Network [OSTI]

    Berins Collier, Ruth; Handlin, Samuel P.

    2005-01-01T23:59:59.000Z

    Handlin IIR Working Paper Shifting Interest Regimes of the2000), “Working-Class Power, Capitalist-Class Interest, andShifting Interest Regimes of the Working Classes in Latin

  10. Lack of Inflated Radii for Kepler Giant Planet Candidates Receiving Modest Stellar Irradiation

    E-Print Network [OSTI]

    Demory, Brice-Olivier

    The most irradiated transiting hot Jupiters are characterized by anomalously inflated radii, sometimes exceeding Jupiter's size by more than 60%. While different theoretical explanations have been applied, none of them ...

  11. Do High Oil Prices Presage Inflation? The Evidence from G-5 Countries

    E-Print Network [OSTI]

    LeBlanc, Michael; Chinn, Menzie David

    2004-01-01T23:59:59.000Z

    Do High Oil Prices Presage Inflation? The Evidence from G-5to be more sensitive to oil prices than in the U.S. , isa dollar denominated oil price. References Blanchard O.J.

  12. Design, Development, and Testing of an Inflatable Habitat Element for NASA Lunar Analogue Studies

    E-Print Network [OSTI]

    Akin, David

    is not pressurized. The inflatable envelope also includes a simulated radiation protection layer and a thermal 5m diameter footprint, an internal volume of 60m2 , and retains its shape when the envelope

  13. Universality of the Volume Bound in Slow-Roll Eternal Inflation

    SciTech Connect (OSTI)

    Dubovsky, Sergei; Senatore, Leonardo; Villadoro, Giovanni

    2012-03-28T23:59:59.000Z

    It has recently been shown that in single field slow-roll inflation the total volume cannot grow by a factor larger than e{sup S{sub dS}/2} without becoming infinite. The bound is saturated exactly at the phase transition to eternal inflation where the probability to produce infinite volume becomes non zero. We show that the bound holds sharply also in any space-time dimensions, when arbitrary higher-dimensional operators are included and in the multi-field inflationary case. The relation with the entropy of de Sitter and the universality of the bound strengthen the case for a deeper holographic interpretation. As a spin-off we provide the formalism to compute the probability distribution of the volume after inflation for generic multi-field models, which might help to address questions about the population of vacua of the landscape during slow-roll inflation.

  14. Electric power annual 1992

    SciTech Connect (OSTI)

    Not Available

    1994-01-06T23:59:59.000Z

    The Electric Power Annual presents a summary of electric utility statistics at national, regional and State levels. The objective of the publication is to provide industry decisionmakers, government policymakers, analysts and the general public with historical data that may be used in understanding US electricity markets. The Electric Power Annual is prepared by the Survey Management Division; Office of Coal, Nuclear, Electric and Alternate Fuels; Energy Information Administration (EIA); US Department of Energy. ``The US Electric Power Industry at a Glance`` section presents a profile of the electric power industry ownership and performance, and a review of key statistics for the year. Subsequent sections present data on generating capability, including proposed capability additions; net generation; fossil-fuel statistics; retail sales; revenue; financial statistics; environmental statistics; electric power transactions; demand-side management; and nonutility power producers. In addition, the appendices provide supplemental data on major disturbances and unusual occurrences in US electricity power systems. Each section contains related text and tables and refers the reader to the appropriate publication that contains more detailed data on the subject matter. Monetary values in this publication are expressed in nominal terms.

  15. Annual Energy Review 1993

    SciTech Connect (OSTI)

    Not Available

    1994-07-14T23:59:59.000Z

    This twelfth edition of the Annual Energy Review (AER) presents the Energy Information Administration`s historical energy statistics. For most series, statistics are given for every year from 1949 through 1993. Because coverage spans four and a half decades, the statistics in this report are well-suited to long-term trend analyses. The AER is comprehensive. It covers all major energy activities, including consumption, production, trade, stocks, and prices, for all major energy commodities, including fossil fuels and electricity. The AER also presents Energy Information Administration (EIA) statistics on some renewable energy sources. EIA estimates that its consumption series include about half of the renewable energy used in the United States. For a more complete discussion of EIA`s renewables data, see p. xix, ``Introducing Expanded Coverage of Renewable Energy Data Into the Historical Consumption Series.`` Copies of the 1993 edition of the Annual Energy Review may be obtained by using the order form in the back of this publication. Most of the data in the 1993 edition also are available on personal computer diskette. For more information about the diskettes, see the back of this publication. In addition, the data are available as part of the National Economic, Social, and Environmental Data Bank on a CD-ROM. For more information about the data bank, contact the US Department of Commerce Economics and Statistics Administration, on 202-482-1986.

  16. The relation between aggression and inflated self-concepts in aggressive children: a replication study

    E-Print Network [OSTI]

    Meehan, Barbara Theresa

    2000-01-01T23:59:59.000Z

    THE RELATION BETWEEN AGGRESSION AND INFLATED SELF-CONCEPTS IN AGGRESSIVE CHILDREN: A REPLICATION STUDY A Thesis BARBARA THERESA MEEHAN Submitted to the Oifice of Graduate Studies of Texas ARM University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE May 2000 Major Subject: Psychology THE RELATION BETWEEN AGGRESSION AND INFLATED SELF-CONCEPTS IN AGGRESSIVE CHILDREN: A REPLICATION STUDY A Thesis BARBARA THERESA MEEHAN Submitted to Texas AdtM University...

  17. Low-energy effective field theory for chromo-natural inflation

    SciTech Connect (OSTI)

    Dimastrogiovanni, Emanuela [School of Physics and Astronomy, University of Minnesota, Minneapolis, 55455 (United States); Fasiello, Matteo; Tolley, Andrew J., E-mail: emanuela1573@gmail.com, E-mail: mrf65@case.edu, E-mail: andrew.j.tolley@case.edu [Department of Physics, Case Western Reserve University, 10900 Euclid Ave, Cleveland, OH 44106 (United States)

    2013-02-01T23:59:59.000Z

    Chromo-natural inflation is a novel model of inflation which relies on the existence of non-abelian gauge fields interacting with an axion. In its simplest realization, an SU(2) gauge field is assumed to begin inflation in a rotationally invariant VEV. The dynamics of the gauge fields significantly modifies the equations of motion for the axion, providing an additional damping term that supports slow-roll inflation, without the need to fine tune the axion decay constant. We demonstrate that in an appropriate slow-roll limit it is possible to integrate out the massive gauge field fluctuations whilst still maintaining the nontrivial modifications of the gauge field to the axion. In this slow-roll limit, chromo-natural inflation is exactly equivalent to a single scalar field effective theory with a non-minimal kinetic term, i.e. a P(X,?) model. This occurs through a precise analogue of the gelaton mechanism, whereby heavy fields can have unsuppressed effects on the light field dynamics without contradicting decoupling. The additional damping effect of the gauge fields can be completely captured by the non-minimal kinetic term of the single scalar field effective theory. We utilize the single scalar field effective theory to infer the power spectrum and non-gaussianities in chromo-natural inflation and confirm that the mass squared of all the gauge field fluctuations is sufficiently large and positive that they completely decouple during inflation. These results confirm that chromo-natural inflation is a viable, stable and compelling model for the generation of inflationary perturbations.

  18. Exit from Inflation with a First-Order Phase Transition and a Gravitational Wave Blast

    E-Print Network [OSTI]

    Amjad Ashoorioon

    2015-03-18T23:59:59.000Z

    In double-field inflation, which exploits two scalar fields, one of the fields rolls slowly during inflation whereas the other field is trapped in a meta-stable vacuum. The nucleation rate from the false vacuum to the true one becomes substantial enough that triggers a first order phase transition and ends inflation. We revisit the question of first order phase transition in an "extended" model of hybrid inflation, realizing the double-field inflationary scenario, and correctly identify the parameter space that leads to a first order phase transition at the end of inflation. We compute the gravitational wave profile which is generated during this first order phase transition. Assuming instant reheating, the peak frequency falls in the $1$ GHz to $10$ GHz frequency band and the amplitude varies in the range $10^{-11}\\lesssim \\Omega_{\\rm GW} h^2 \\lesssim 10^{-8}$, depending on the value of the cosmological constant in the false vacuum. The signature could be observed by the planned Chongqing high frequency gravitational probe. For a narrow band of vacuum energies, the first order phase transition can happen after the end of inflation via the violation of slow-roll, with a peak frequency that varies from $1$ THz to $100$ THz. For smaller values of cosmological constant, even though inflation can end via slow-roll violation, the universe gets trapped in a false vacuum whose energy drives a second phase of eternal inflation. This range of vacuum energies do not lead to viable inflationary models, unless the value of the cosmological constant is compatible with the observed value, $M\\sim 10^{-3}$ eV.

  19. UC Center for Information Technology Research in the Interest...

    Open Energy Info (EERE)

    UC Center for Information Technology Research in the Interest of Society (CITRIS) Jump to: navigation, search Logo: UC Center for Information Technology Research in the Interest of...

  20. National Interest Security Company NISC Formerly Technology Management...

    Open Energy Info (EERE)

    National Interest Security Company NISC Formerly Technology Management Services TMS Inc Jump to: navigation, search Name: National Interest Security Company (NISC) (Formerly...

  1. (Expired) Nationwide Limited Public Interest Waiver for LED Lighting...

    Energy Savers [EERE]

    (Expired) Nationwide Limited Public Interest Waiver for LED Lighting and HVAC Units: February 11, 2010 (Expired) Nationwide Limited Public Interest Waiver for LED Lighting and HVAC...

  2. Eighth Annual Risk Management Conference

    E-Print Network [OSTI]

    Chaudhuri, Sanjay

    Eighth Annual Risk Management Conference Risk Management Amidst Global Rebalancing 10 ­ 11 July 2014, Singapore The Risk Management Institute (RMI) at the National University of Singapore invites submissions for its 8th annual conference on risk management in Singapore on 10 and 11 July 2014. We

  3. ANNUAL SECURITY & FIRE SAFETY REPORT

    E-Print Network [OSTI]

    Maxwell, Bruce D.

    ANNUAL SECURITY & FIRE SAFETY REPORT 2014 A guide to policies, procedures, practices, and programs implemented to keep students, faculty, and staff safe and facilities secure. www.montana.edu/reports/security.pdf #12;Inside this Report 2014 Annual Security and Fire Safety Report for Reporting Year 2013

  4. Annual Energy Outlook Retrospective Review

    Reports and Publications (EIA)

    2015-01-01T23:59:59.000Z

    The Annual Energy Outlook Retrospective Review provides a yearly comparison between realized energy outcomes and the Reference case projections included in previous Annual Energy Outlooks (AEO) beginning with 1982. This edition of the report adds the AEO 2012 projections and updates the historical data to incorporate the latest data revisions.

  5. Warped Tachyonic Inflation in Type IIB Flux Compactifications and the Open-String Completeness Conjecture

    E-Print Network [OSTI]

    Daniel Cremades; Fernando Quevedo; Aninda Sinha

    2005-11-14T23:59:59.000Z

    We consider a cosmological scenario within the KKLT framework for moduli stabilization in string theory. The universal open string tachyon of decaying non-BPS D-brane configurations is proposed to drive eternal topological inflation. Flux-induced `warping' can provide the small slow-roll parameters needed for successful inflation. Constraints on the parameter space leading to sufficient number of e-folds, exit from inflation, density perturbations and stabilization of the Kahler modulus are investigated. The conditions are difficult to satisfy in Klebanov-Strassler throats but can be satisfied in T^3 fibrations and other generic Calabi-Yau manifolds. This requires large volume and magnetic fluxes on the D-brane. The end of inflation may or may not lead to cosmic strings depending on the original non-BPS configuration. A careful investigation of initial conditions leading to a phenomenologically viable model for inflation is carried out. The initial conditions are chosen on the basis of Sen's open string completeness conjecture. We find time symmetrical bounce solutions without initial singularities for k=1 FRW models which are correlated with an inflationary period. Singular big-bang/big-crunch solutions also exist but do not lead to inflation. There is an intriguing correlation between having an inflationary universe in 4 dimensions and 6 compact dimensions or a big-crunch singularity and decompactification.

  6. EARTH SCIENCES DIVISION ANNUAL REPORT 1978

    E-Print Network [OSTI]

    Authors, Various

    2012-01-01T23:59:59.000Z

    Mexico, 52nd Annual Fall Technical Conference and Exhibition of the SOC. Pet.Mexico. Preprint, 52nd annual meeting cf the SOC. of Pet.

  7. Secretarial Annual Awards Program | Department of Energy

    Energy Savers [EERE]

    Secretarial Annual Awards Program Secretarial Annual Awards Program The DOE Mentor of the Year award recognizes the efforts of a DOE Mentor that has exceeded the...

  8. EIA - Annual Energy Outlook 2014 Early Release

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Annual Energy Outlook 2013 LED Light emitting diode AEO2014 Annual Energy Outlook 2014 LNG Liquefied natural gas ATRA American Taxpayer Relief Act of 2012 LPG Liquefied petroleum...

  9. Geothermal Technologies Program Annual Peer Review Presentation...

    Energy Savers [EERE]

    Technologies Program Annual Peer Review Presentation By Doug Hollett Geothermal Technologies Program Annual Peer Review Presentation By Doug Hollett 2012 Peer Review presentation...

  10. NERSC Announces Third Annual HPC Achievement Awards

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Computing Center (NERSC) announced the winners of its third annual High Performance Computing (HPC) Achievement Awards on Feb. 24, 2015, during the annual NERSC User...

  11. Presidential Permit Holders - Annual Reports | Department of...

    Energy Savers [EERE]

    Permit Holders - Annual Reports Presidential Permit Holders - Annual Reports Presidential permit holders are responsible for reporting the gross amount electric energy which flows...

  12. Postdoctoral Research Awards Annual Research Meeting: Padmaja...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Padmaja Gunda Postdoctoral Research Awards Annual Research Meeting: Padmaja Gunda Poster Presentation at 2012 EERE Annual Research Meeting, Postdoctoral Research Awards, from the...

  13. Postdoctoral Research Awards Annual Research Meeting: Brandon...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Brandon Mercado Postdoctoral Research Awards Annual Research Meeting: Brandon Mercado Poster Presentation at 2012 EERE Annual Research Meeting, Postdoctoral Research Awards, from...

  14. EIA - Annual Energy Outlook 2011 Early Release

    Gasoline and Diesel Fuel Update (EIA)

    January STEO Annual projections to 2040 International projections All projections reports Analysis & Projections Major Topics Most popular Annual Energy Outlook related...

  15. Environmental research program: FY 1987, annual report

    SciTech Connect (OSTI)

    Not Available

    1988-03-01T23:59:59.000Z

    This multidisciplinary research program includes fundamental and applied research in physics, chemistry, engineering, and biology, as well as research on the development of advanced methods of measurement and analysis. The Program's Annual Report contains summaries of research performed during FY 1987 in the areas of atmospheric aerosols, flue gas chemistry, combustion, membrane bioenergetics, and analytical chemistry. The main research interests of the Atmospheric Aerosol Research group concern the chemical and physical processes that occur in haze, clouds, and fogs. For their studies, the group is developing novel analytical and research methods for characterizing aerosol species. Aerosol research is performed in the laboratory and in the field. Studies of smoke emissions from fires and their possible effects on climatic change, especially as related to nuclear winter, are an example of the collaboration between the Atmospheric Aerosol Research and Combustion Research Groups.

  16. Annual energy review 1994

    SciTech Connect (OSTI)

    NONE

    1995-07-01T23:59:59.000Z

    This 13th edition presents the Energy Information Administration`s historical energy statistics. For most series, statistics are given for every year from 1949 through 1994; thus, this report is well-suited to long-term trend analyses. It covers all major energy activities, including consumption, production, trade, stocks, and prices for all major energy commodities, including fossil fuels and electricity. Statistics on renewable energy sources are also included: this year, for the first time, usage of renewables by other consumers as well as by electric utilities is included. Also new is a two-part, comprehensive presentation of data on petroleum products supplied by sector for 1949 through 1994. Data from electric utilities and nonutilities are integrated as ``electric power industry`` data; nonutility power gross generation are presented for the first time. One section presents international statistics (for more detail see EIA`s International Energy Annual).

  17. Uranium Industry Annual, 1992

    SciTech Connect (OSTI)

    Not Available

    1993-10-28T23:59:59.000Z

    The Uranium Industry Annual provides current statistical data on the US uranium industry for the Congress, Federal and State agencies, the uranium and electric utility industries, and the public. The feature article, ``Decommissioning of US Conventional Uranium Production Centers,`` is included. Data on uranium raw materials activities including exploration activities and expenditures, resources and reserves, mine production of uranium, production of uranium concentrate, and industry employment are presented in Chapter 1. Data on uranium marketing activities including domestic uranium purchases, commitments by utilities, procurement arrangements, uranium imports under purchase contracts and exports, deliveries to enrichment suppliers, inventories, secondary market activities, utility market requirements, and uranium for sale by domestic suppliers are presented in Chapter 2.

  18. Uranium industry annual 1996

    SciTech Connect (OSTI)

    NONE

    1997-04-01T23:59:59.000Z

    The Uranium Industry Annual 1996 (UIA 1996) provides current statistical data on the US uranium industry`s activities relating to uranium raw materials and uranium marketing. The UIA 1996 is prepared for use by the Congress, Federal and State agencies, the uranium and nuclear electric utility industries, and the public. Data on uranium raw materials activities for 1987 through 1996 including exploration activities and expenditures, EIA-estimated reserves, mine production of uranium, production of uranium concentrate, and industry employment are presented in Chapter 1. Data on uranium marketing activities for 1994 through 2006, including purchases of uranium and enrichment services, enrichment feed deliveries, uranium fuel assemblies, filled and unfilled market requirements, uranium imports and exports, and uranium inventories are shown in Chapter 2. A feature article, The Role of Thorium in Nuclear Energy, is included. 24 figs., 56 tabs.

  19. Coal industry annual 1993

    SciTech Connect (OSTI)

    Not Available

    1994-12-06T23:59:59.000Z

    Coal Industry Annual 1993 replaces the publication Coal Production (DOE/FIA-0125). This report presents additional tables and expanded versions of tables previously presented in Coal Production, including production, number of mines, Productivity, employment, productive capacity, and recoverable reserves. This report also presents data on coal consumption, coal distribution, coal stocks, coal prices, coal quality, and emissions for a wide audience including the Congress, Federal and State agencies, the coal industry, and the general public. In addition, Appendix A contains a compilation of coal statistics for the major coal-producing States. This report does not include coal consumption data for nonutility Power Producers who are not in the manufacturing, agriculture, mining, construction, or commercial sectors. This consumption is estimated to be 5 million short tons in 1993.

  20. 1994 MCAP annual report

    SciTech Connect (OSTI)

    Harmony, S.C.; Boyack, B.E.

    1995-04-01T23:59:59.000Z

    VELCOR is an integrated, engineering-level computer code that models the progression of severe accidents in light water reactor (LWR) nuclear power plants. The entire spectrum of severe accident phenomena, including reactor coolant system and containment thermal-hydraulic response, core heatup, degradation and relocation, and fission product release and transport is treated in MELCOR in a unified framework for both boiling water reactors (BWRs) and pressurized water reactors (PWRs). Its current uses include the estimation of severe accident source terms and their sensitivities and uncertainties in a variety of applications. Independent assessment efforts have been successfully completed by the US and international MELCOR user communities. Most of these independent assessment efforts have been conducted to support the needs and fulfill the requirements of the individual user organizations. The resources required to perform an extensive set of model and integral code assessments are large. A prudent approach to fostering code development and maturation is to coordinate the individual assessment efforts of the MELCOR user community. While retaining individual control over assessment resources, each organization using the MELCOR code could work with the other users to broaden assessment coverage and minimize duplication. In recognition of these considerations, the US Nuclear Regulatory Commission (US NRC) has initiated the MELCOR Cooperative Assessment Program (MCAP), a vehicle for coordinating and standardizing the assessment practices of the various MELCOR users. In addition, the user community will have a forum to better communicate lessons learned regarding MELCOR applications, capabilities, and user guidelines and limitations and to provide a user community perspective on code development needs and priorities. This second Annual Report builds on the foundation laid with the first Annual Report.

  1. Inflation driven by q-de Sitter in light of Planck 2013 and BICEP2 results

    E-Print Network [OSTI]

    M. R. Setare; D. Momeni; V. Kamali; R. Myrzakulov

    2014-09-09T23:59:59.000Z

    We propose a generalised de Sitter scale factor for the cosmology of early and late time universe, including single scalar field is called as inflaton. This form of scale factor has a free parameter $q$ is called as nonextensivity parameter. When $q=1$, the scale factor is de Sitter. This scale factor is an intermediate form between power-law and de Sitter. We study cosmology of such families. We show that both kinds of dark components, dark energy and dark matter simultaneously are described by this family of solutions. As a motivated idea, we investigate inflation in the framework of $q$-de Sitter. We consider three types of scenarios for inflation. In a single inflation scenario, we observe that, inflation ended without any specific ending inflation $\\phi_{end}$, the spectral index and the associated running of the spectral index are %$ n_\\mathrm{s} - 1 \\sim -2\\epsilon, \\quad \\alpha_\\mathrm{s} \\equiv 0 $. To end the inflation: we should have $q=\\frac{3}{4}$. We deduce that the inflation ends when the evolution of the scale factor is $a (t) =e_ {3/4} (t) $. With this scale factor there is no need to specify $\\phi_{end}$. As an alternative to have inflation with ending point, We will study q-inflation model in the context of warm inflation. We propose two forms of damping term $\\Gamma$. In the first case when $\\Gamma=\\Gamma_0$, we show the scale invariant spectrum, (Harrison-Zeldovich spectrum, i.e. $n_s=1$) may be approximately presented by ($q=\\frac{9}{10},~~N=70$). Also there is a range of values of $R$ and $n_s$ which is compatible with the BICEP2 data where $q=\\frac{9}{10}$. In case $\\Gamma=\\Gamma_1V(\\phi)$, it is observed that small values of a number of e-folds are assured for small values of $q$ parameter. For $q=\\frac{9}{10}$ a range of values of $R$ and $n_s$ is compatible with the BICEP2 data.

  2. 2004 Annual Meeting - Genes, Mutations and Disease: The Environmental Connection

    SciTech Connect (OSTI)

    Leona D. Samson, Ph.D.

    2004-08-23T23:59:59.000Z

    The Meeting consisted of 9 Symposia, 4 Keynote Lectures, 3 Platform Sessions and 4 Poster Sessions. In addition there were Breakfast Meetings for Special Interest Groups designed to inform attendees about the latest advances in environmental mutagenesis research. Several of the topics to be covered at this broad meeting will be of interest to the Department of Energy, Office of Science. The relevance of this meeting to the DOE derives from the fact that low dose radiation may represent one of the most significant sources of human mutations that are attributable to the environment. The EMS membership, and those who attended the EMS Annual Meeting were interested in both chemical and radiation induced biological effects, such as cell death, mutation, teratogenesis, carcinogenesis and aging. These topics thate were presented at the 2004 EMS Annual meeting that were of clear interest to DOE include: human variation in cancer susceptibility, unusual mechanisms of mutation, germ and stem cell mutagenesis, recombination and the maintenance of genomic stability, multiple roles for DNA mismatch repair, DNA helicases, mutation, cancer and aging, Genome-wide transcriptional responses to environmental change, Telomeres and genomic stability: when ends don?t meet, systems biology approach to cell phenotypic decision processes, and the surprising biology of short RNAs. Poster and platform sessions addressed topics related to environmental mutagen exposure, DNA repair, mechanisms of mutagenesis, epidemiology, genomic and proteomics and bioinformatics. These sessions were designed to give student, postdocs and more junior scientists a chance to present their workl.

  3. NREL Annual Environmental Performance Reports (Annual Site Environment...

    Broader source: Energy.gov (indexed) [DOE]

    Every year NREL prepares an Environmental Performance Report meeting the requirements of an Annual Site Environmental Report (ASER) per DOE Order 231.1B. The report is written to...

  4. Is a Higgs Vacuum Instability Fatal for High-Scale Inflation?

    E-Print Network [OSTI]

    John Kearney; Hojin Yoo; Kathryn M. Zurek

    2015-03-17T23:59:59.000Z

    We study the inflationary evolution of a scalar field $h$ with an unstable potential for the case where the Hubble parameter $H$ during inflation is larger than the instability scale $\\Lambda_I$ of the potential. Quantum fluctuations in the field of size $\\delta h \\sim \\frac{H}{2 \\pi}$ imply that the unstable part of the potential is sampled during inflation. We investigate the evolution of these fluctuations to the unstable regime, and in particular whether they generate cosmological defects or even terminate inflation. We apply the results of a toy scalar model to the case of the Standard Model (SM) Higgs boson, whose quartic evolves to negative values at high scales, and extend previous analyses of Higgs dynamics during inflation utilizing statistical methods to a perturbative and fully gauge-invariant formulation. We show that the dynamics are controlled by the renormalization group-improved quartic coupling $\\lambda(\\mu)$ evaluated at a scale $\\mu = H$, such that Higgs fluctuations are enhanced by the instability if $H > \\Lambda_I$. Even if $H > \\Lambda_I$, the instability in the SM Higgs potential does not end inflation; instead the universe slowly sloughs off crunching patches of space that never come to dominate the evolution. As inflation proceeds past 50 $e$-folds, a significant proportion of patches exit inflation in the unstable vacuum, and as much as 1% of the spacetime can rapidly evolve to a defect. Depending on the nature of these defects, however, the resulting universe could still be compatible with ours.

  5. Mixed non-Gaussianity in multiple-DBI inflation

    SciTech Connect (OSTI)

    Emery, Jon; Tasinato, Gianmassimo; Wands, David, E-mail: jon.emery@port.ac.uk, E-mail: gianmassimo.tasinato@port.ac.uk, E-mail: david.wands@port.ac.uk [Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth, PO1 3FX (United Kingdom)

    2013-05-01T23:59:59.000Z

    We study a model of multiple-field DBI inflation leading to mixed form of primordial non-Gaussianity, including equilateral and local bispectrum shapes. We present a general formalism based on the Hamilton-Jacobi approach, allowing us to go beyond slow-roll, combining the three-point function for the fields at Hubble-exit with the non-linear evolution of super-Hubble scales. We are able to obtain analytic results by taking a separable Ansatz for the Hubble rate. We find general expressions for both the equilateral and local type non-Gaussianity parameter f{sub NL}. The equilateral non-Gaussianity includes the usual enhancement for small sound speeds, but multiplied by an analytic factor which can lead to a suppression. We illustrate our results with two scenarios. In the first model, previously found to have detectable local non-Gaussianity, we find that the equilateral signal is not sufficiently suppressed to evade current observational bounds. In our second scenario we construct a model which exhibits both a detectable equilateral f{sub NL} and a negative local f{sub NL}.

  6. Inflationary Magnetogenesis in $R^{2}$-Inflation after Planck 2015

    E-Print Network [OSTI]

    AlMuhammad, Anwar Saleh

    2015-01-01T23:59:59.000Z

    We study the primordial magnetic field generated by the simple model $f^2 FF$ in Starobinsky, $R^2$-inflationary, model. The scale invariant PMF is achieved at relatively high power index of the coupling function, $\\left| \\alpha \\right| \\approx 7.44$. This model does not suffer from the backreaction problem as long as, the rate of inflationary expansion, $H$, is in the order of or less than the upper bound reported by Planck ($\\le 3.6 \\times 10^{-5} M_\\rm{Pl}$) in both de Sitter and power law expansion, which show similar results. We calculate the lower limit of the reheating parameter, $R_\\rm{rad} > 6.888$ in $R^2$-inflation. Based on the upper limit obtained from CMB, we find that the upper limits of magnetic field and reheating energy density as, $\\left(\\rho_{B_\\rm{end}} \\right)_\\rm{CMB} < 1.184 \\times 10^{-20} M_\\rm{Pl}^4$ and $\\left(\\rho_\\rm{reh} \\right)_\\rm{CMB} < 8.480 \\times 10^{-22} M_\\rm{Pl}^4$. All of foregoing results are well more than the lower limit derived from WMAP7 for both large and s...

  7. Testing Inflation with Large Scale Structure: Connecting Hopes with Reality

    E-Print Network [OSTI]

    Marcelo Alvarez; Tobias Baldauf; J. Richard Bond; Neal Dalal; Roland de Putter; Olivier Doré; Daniel Green; Chris Hirata; Zhiqi Huang; Dragan Huterer; Donghui Jeong; Matthew C. Johnson; Elisabeth Krause; Marilena Loverde; Joel Meyers; P. Daniel Meerburg; Leonardo Senatore; Sarah Shandera; Eva Silverstein; Anže Slosar; Kendrick Smith; Matias Zaldarriaga; Valentin Assassi; Jonathan Braden; Amir Hajian; Takeshi Kobayashi; George Stein; Alexander van Engelen

    2014-12-15T23:59:59.000Z

    The statistics of primordial curvature fluctuations are our window into the period of inflation, where these fluctuations were generated. To date, the cosmic microwave background has been the dominant source of information about these perturbations. Large scale structure is however from where drastic improvements should originate. In this paper, we explain the theoretical motivations for pursuing such measurements and the challenges that lie ahead. In particular, we discuss and identify theoretical targets regarding the measurement of primordial non-Gaussianity. We argue that when quantified in terms of the local (equilateral) template amplitude $f_{\\rm NL}^{\\rm loc}$ ($f_{\\rm NL}^{\\rm eq}$), natural target levels of sensitivity are $\\Delta f_{\\rm NL}^{\\rm loc, eq.} \\simeq 1$. We highlight that such levels are within reach of future surveys by measuring 2-, 3- and 4-point statistics of the galaxy spatial distribution. This paper summarizes a workshop held at CITA (University of Toronto) on October 23-24, 2014.

  8. Inflation, de Sitter Landscape and Super-Higgs effect

    E-Print Network [OSTI]

    Renata Kallosh; Andrei Linde; Marco Scalisi

    2015-01-05T23:59:59.000Z

    We continue developing cosmological models involving nilpotent chiral superfields, which provide a simple unified description of inflation and the current acceleration of the universe in the supergravity context. We describe here a general class of models with a positive cosmological constant at the minimum of the potential, such that supersymmetry is spontaneously broken in the direction of the nilpotent superfield $S$. In the unitary gauge, these models have a simple action where all highly non-linear fermionic terms of the classical Volkov-Akulov action disappear. We present masses for bosons and fermions in these theories. By a proper choice of parameters in this class of models, one can fit any possible set of the inflationary parameters $n_{s}$ and $r$, a broad range of values of the vacuum energy $V_{0}$, which plays the role of the dark energy, and achieve a controllable level of supersymmetry breaking. This can be done without introducing light moduli, such as Polonyi fields, which often lead to cosmological problems in phenomenological supergravity.

  9. Starobinsky-like inflation induced by f(T) gravity

    E-Print Network [OSTI]

    W. El Hanafy; G. L. Nashed

    2014-10-08T23:59:59.000Z

    We study a single fluid component in a flat like universe governed by $f(T)$ gravity theories. The flat like universe does not imply a vanishing sectional curvature $k$, but assuming a vanishing of the coefficient of $k$ in the modified Friedmann equations. This enables us to extract a compatible pair of a scale factor $a(t)$ and an inverse power series $f(T)$. The Equation of State (EoS) evolves similarly in all models $k=0, \\pm 1$. In large Hubble ($H$)-spacetime the theory is consistent with the inflationary universe scenario and respects the conservation principle. We study the case when the teleparallel torsion is made of a single scalar field. The theory produces Starobinsky model naturally at its zeroth order without using a conformal transformation. Higher order solutions continuously interpolate between Starobinsky and quadratic inflation models. The slow-roll analysis shows double solutions so that for a single value of the spectral index $n_{s}$ the theory can predict double tensor-to-scalar ratios $r$ of Planck and BICEP2 data.

  10. Noncommutative minisuperspace, gravity-driven acceleration and kinetic inflation

    E-Print Network [OSTI]

    S. M. M. Rasouli; Paulo Vargas Moniz

    2014-11-05T23:59:59.000Z

    In this paper, we introduce a noncommutative version of the Brans-Dicke (BD) theory and obtain the Hamiltonian equations of motion for a spatially flat Friedmann--Lema\\^{\\i}tre--Robertson--Walker universe filled with a perfect fluid. We focus on the case where the scalar potential as well as the ordinary matter sector are absent. Then, we investigate gravity-driven acceleration and kinetic inflation in this noncommutative BD cosmology. In contrast to the commutative case, in which the scale factor and BD scalar field are in a power-law form, in the noncommutative case the power-law scalar factor is multiplied by a dynamical exponential warp factor. This warp factor depends on the noncommutative parameter as well as the momentum conjugate associated to the BD scalar field. We show that the BD scalar field and the scale factor effectively depend on the noncommutative parameter. For very small values of this parameter, we obtain an appropriate inflationary solution, which can overcome problems within BD standard cosmology in a more efficient manner. Furthermore, a graceful exit from an early acceleration epoch towards a decelerating radiation epoch is provided. For late times, due to the presence of the noncommutative parameter, we obtain a zero acceleration epoch, which can be interpreted as the coarse-grained explanation.

  11. 2012 Annual Report Research Reactor Infrastructure Program

    SciTech Connect (OSTI)

    Douglas Morrell

    2012-11-01T23:59:59.000Z

    The content of this report is the 2012 Annual Report for the Research Reactor Infrastructure Program.

  12. Monthly/Annual Energy Review - nuclear section

    Reports and Publications (EIA)

    2015-01-01T23:59:59.000Z

    Monthly and latest annual statistics on nuclear electricity capacity, generation, and number of operable nuclear reactors.

  13. Osmoregulation in Methanogens (and other interesting organisms)

    SciTech Connect (OSTI)

    Roberts, Mary Fedarko

    2014-12-03T23:59:59.000Z

    Our research has been aimed at (i) identifying, (ii) determining mode of regulation, and (iii) understanding how different classes of compatible solutes (also termed osmolytes) affect macromolecular stability in response to osmotic and thermal stress. For solutes we have identified (e.g., di-inositol-1,1’-phosphate (DIP)), we used NMR to elucidate biosynthetic pathways and then cloned suspected enzymes in the pathway to explore how they are regulated. Compatible solutes are thought to protect proteins from thermal and osmotic stresses by being excluded from the surface, allowing critical water molecules to interact with the protein. This implies there are no specific binding interactions between osmolytes and proteins. However, we and others have often observed very specific solute effects for proteins that suggest a more direct interaction between solute and protein is likely can occur. Measuring such a weak interaction is extremely difficult. We have developed a solution NMR method, high-resolution field cycling relaxometry, that can measure spin-lattice relaxation rates as a function of magnetic field from 11.7 (the field of a 500 MHz spectrometer) to 0.003 T. The methodology is ideal for nuclei in small molecules with moderately long relaxation times at high fields – phosphate groups (31P), enriched carbonyls (13C), or methyl groups (1H). The protein of interest is spin-labeled to introduce a large dipole on it that will dominate the relaxation of nuclei on any small molecules that bind transiently. The key is to measure relaxation below 1-2 T (and extract nuclei-spin label distances in the bound complex) where the small molecule relaxation will be dominated by dipolar mechanisms with a correlation time indicative of the large protein complex. Our explorations of an inositol monophosphatase (the last step in DIP generation) localized four discrete binding sides for the thermoprotectant ?-glutamate. This is a novel approach, and while the work did not fully explain how this solute protected the IMPase from thermal denaturation, it did showcase a new and exciting method to monitor weak binding in biological systems.

  14. Data Management Group Annual Report

    E-Print Network [OSTI]

    Toronto, University of

    Data Management Group Annual Report 2001 prepared by: Data Management Group Joint Program..............................................................................2 Text Based Data Retrieval System `drs' ..........................................................2 Internet Browser Data Retrieval System (iDRS)..............................................3 Complex Data

  15. Data Management Group Annual Report

    E-Print Network [OSTI]

    Toronto, University of

    Data Management Group Annual Report 1999 prepared by: Data Management Group Joint Program................................................................. 1 INFORMATION PROCESSING ............................................. 2 Text Based Data Retrieval System `drs' ........................ 2 Internet Browser Data Retrieval System (iDRS) ............ 3

  16. Data Management Group Annual Report

    E-Print Network [OSTI]

    Toronto, University of

    iv Data Management Group Annual Report 2003 City of Hamilton City of Toronto GO Transit Regional of York Toronto Transit Commission The Data Management Group is a research program located ........................................................................................................ 3 Text-based Data Retrieval System `drs

  17. Year in Review Annual Report

    E-Print Network [OSTI]

    Machery, Edouard

    Year in Review 2005-06 Annual Report Center for Latin American Studies University Center for International Studies University of Pittsburgh #12;2005-06 Year in Review 2 Message from the Acting Director

  18. ANNUAL FINANCIAL REPORT Queen's University

    E-Print Network [OSTI]

    Abolmaesumi, Purang

    .............................................................................................. i The year in review ...............................................14 #12;Queen's University at Kingston - Annual Financial Report - September, 1999 · 1 THE YEAR IN REVIEW 1995 1996 1997 1998 1999 0 100 200 300 400 500 All Other Tuition Fees Government Grants

  19. Year in Review Annual Report

    E-Print Network [OSTI]

    Machery, Edouard

    Year in Review 2004-05 Annual Report Center for Latin American Studies University Center for International Studies University of Pittsburgh #12;2004-05 Year in Review 2 Message from the Director This has

  20. Year in Review Annual Report

    E-Print Network [OSTI]

    Machery, Edouard

    Year in Review 2006-07 Annual Report Center for Latin American Studies University Center for International Studies University of Pittsburgh #12;2006-07 Year in Review 2 Message from the Director Academic

  1. 12th Annual Minnesota Pavement

    E-Print Network [OSTI]

    Minnesota, University of

    12th Annual Minnesota Pavement Conference: Session Summaries Conference Sponsors: Minnesota Research Alliance (TERRA) Pavement Research Institute (PRI) Hosted by: Center for Transportation Studies provides information to practitioners and others in pavement design, construction, and maintenance

  2. ITCN 49th Annual Conference

    Broader source: Energy.gov [DOE]

    Inter-Tribal Council of Nevada (ITCN) is hosting its annual conference titled, "Making A Difference for Nevada Tribes." ITCN is a consortia of the 27 tribal communities throughout the state of...

  3. LLNL NESHAPs 2004 Annual Report

    SciTech Connect (OSTI)

    Harrach, R; Gallegos, G; Peterson, R; Wilson, K; Harrach, R J; Gallegos, G M; Peterson, S R; Wilson, K R

    2005-06-27T23:59:59.000Z

    This annual report is prepared pursuant to the National Emission Standards for Hazardous Air Pollutants (NESHAPs; Title 40 Code of Federal Regulations [CFR] Part 61, Subpart H). Subpart H governs radionuclide emissions to air from Department of Energy (DOE) facilities.

  4. ITCN 49th Annual Convention

    Broader source: Energy.gov [DOE]

    The Inter-Tribal Council of Nevada, Inc. will be hosting its 49th Annual Convention, themed "Making a Difference for Nevada Tribes," December 8-11, 2014 at John Ascuaga’s Nugget in Sparks, Nevada.

  5. PRB Coal Users' Group enjoys growing interest in its concerns

    SciTech Connect (OSTI)

    Rahm, R. [CoalTech Consultants Inc. (United States)

    2008-07-15T23:59:59.000Z

    A review is given of some of the topics discussed at the PRB Coal Users' Group annual meeting, including combustion dusts and a new session on conveyor belts. 7 figs.

  6. 2007 LDRD ANNUAL REPORT

    SciTech Connect (OSTI)

    French, T

    2008-12-16T23:59:59.000Z

    I am pleased to present the fiscal year 2007 Laboratory Directed Research and Development (LDRD) annual report. This represents the first year that SRNL has been eligible for LDRD participation and our results to date demonstrate we are off to an excellent start. SRNL became a National Laboratory in 2004, and was designated the 'Corporate Laboratory' for the DOE Office of Environmental Management (EM) in 2006. As you will see, we have made great progress since these designations. The LDRD program is one of the tools SRNL is using to enable achievement of our strategic goals for the DOE. The LDRD program allows the laboratory to blend a strong basic science component into our applied technical portfolio. This blending of science with applied technology provides opportunities for our scientists to strengthen our capabilities and delivery. The LDRD program is vital to help SRNL attract and retain leading scientists and engineers who will help build SRNL's future and achieve DOE mission objectives. This program has stimulated our research staff creativity, while realizing benefits from their participation. This investment will yield long term dividends to the DOE in its Environmental Management, Energy, and National Security missions.

  7. Quantifying national information interests using the activity of Wikipedia editors

    E-Print Network [OSTI]

    Karimi, Fariba; Samoilenko, Ann; Rosvall, Martin; Lancichinetti, Andrea

    2015-01-01T23:59:59.000Z

    We live in a "global village" where electronic communication has eliminated the geographical barriers of information exchange. With global information exchange, the road is open to worldwide convergence of opinions and interests. However, it remains unknown to what extent interests actually have become global. To address how interests differ between countries, we analyze the information exchange in Wikipedia, the largest online collaborative encyclopedia. From the editing activity in Wikipedia, we extract the interest profiles of editors from different countries. Based on a statistical null model for interest profiles, we create a network of significant links between countries with similar interests. We show that countries are divided into 18 clusters with similar interest profiles in which language, geography, and historical background polarize the interests. Despite the opportunities of global communication, the results suggest that people nevertheless care about local information.

  8. Sources of information utilized by California agricultural interest groups 

    E-Print Network [OSTI]

    Noble, Elisa Lynn

    2006-10-30T23:59:59.000Z

    Existing interest group theory describes legislative decision-making as a communication process whereby interest groups research information on issues, combine this information with constituent opinions, and present the resulting information...

  9. LBNL Conflict of Interest Advisory Committee (COIAC) Meeting Dates*

    E-Print Network [OSTI]

    LBNL Conflict of Interest Advisory Committee (COIAC) Meeting Dates* June 11, 2014 July 9, 2014 Aug Integrity Office Charter The LBNL Conflict of Interest Advisory Committee (COIAC or committee) acts

  10. Interested in Hydrogen and Fuel Cell Technologies? Help Shape...

    Broader source: Energy.gov (indexed) [DOE]

    Interested in Hydrogen and Fuel Cell Technologies? Help Shape the H2 Refuel H-Prize Competition Interested in Hydrogen and Fuel Cell Technologies? Help Shape the H2 Refuel H-Prize...

  11. Web points of interest - Department of Mathematics, Purdue University

    E-Print Network [OSTI]

    Mathematics Web points of interest: AMS Professional Services. American Mathematical Society · Combined Membership List Search · Mathematics on the Web ...

  12. Other Purdue Web points of Interest - Purdue University

    E-Print Network [OSTI]

    Other Purdue Web points of interest. Purdue University Home Page --- Schedule of Classes · Graduate School · Agronomy · Computer Science --- CS & E ...

  13. Conflict of Interest Review CRADA Principal Investigator's Certification

    E-Print Network [OSTI]

    Baker, Chris I.

    Conflict of Interest Review CRADA Principal Investigator's Certification CRADA Principal Investigator: ______________________________ IC: ___________________________ CRADA ID Number: _________________ Collaborating Organization: ________________________________________________ CRADA Title

  14. Primordial gravitational wave of BICEP2 from dynamical double hybrid inflation

    E-Print Network [OSTI]

    Ki-Young Choi; Bumseok Kyae

    2014-06-30T23:59:59.000Z

    BICEP2 has observed a primordial gravitational wave corresponding to the tensor-to-scalar ratio of 0.16. It seems to require a super-Planckian inflationary model. In this paper, we propose a double hybrid inflation model, where the inflaton potential dynamically changes with the evolution of the inflaton fields. During the first phase of inflation over 7 e-folds, the power spectrum can be almost constant by a large linear term in the hybrid potential, which is responsible also for the large tensor-to-scalar ratio. In the second phase of 50 e-folds, the dominant potential becomes dynamically changed to the logarithmic form as in the ordinary supersymmetric hybrid inflation, which is performed by the second inflaton field. In this model, the sub-Planckian field values (~0.9 M_P) can still yield the correct cosmic observations with the sufficient e-folds.

  15. Graceful exit from inflation to radiation era with rapidly decreasing agegraphic potentials

    E-Print Network [OSTI]

    Stefano Viaggiu; Marco Montuori

    2014-10-23T23:59:59.000Z

    We present a class of models where both the primordial inflation and the late times de Sitter phase are driven by simple phenomenological agegraphic potentials. In this context, a possible new scenario for a smooth exit from inflation to the radiation era is discussed by resorting the kination (stiff) era but without the inefficient radiation production mechanism of these models. This is done by considering rapidly decreasing expressions for $V(t)$ soon after inflation. We show that the parameters of our models can reproduce the scalar spectral parameter $n_s$ predicted by Planck data in particular for models with concave potentials. Finally, according to the recent BICEP2 data, all our models allow a huge amount of primordial gravitational waves.

  16. First Test of High Frequency Gravity Waves from Inflation using ADVANCED LIGO

    E-Print Network [OSTI]

    Alejandro Lopez; Katherine Freese

    2015-01-11T23:59:59.000Z

    Inflation models ending in a first order phase transition produce gravitational waves (GW) via bubble collisions of the true vacuum phase. We demonstrate that these bubble collisions can leave an observable signature in Advanced LIGO, an upcoming ground-based GW experiment. These GW are dependent on two parameters of the inflationary model: $\\varepsilon$ represents the energy difference between the false vacuum and the true vacuum of the inflaton potential, and $\\chi$ measures how fast the phase transition ends ($\\chi \\sim$ the number of e-folds during the actual phase transition). Advanced LIGO will be able to test the validity of single-phase transition models within the parameter space $10^7 \\rm{GeV}\\lesssim \\varepsilon^{1/4} \\lesssim 10^{10} \\rm{GeV}$ and $0.19 \\lesssim \\chi \\lesssim 1$. If inflation occurred through a first order phase transition, then Advanced LIGO could be the first to discover high frequency GW from inflation.

  17. Conflict of Interest and Work Outside the University

    E-Print Network [OSTI]

    Howat, Ian M.

    Conflict of Interest and Work Outside the University Policy 1.30 Office of Human Resources Applies of interest management agreement. Definitions Term Definition Designated work time Hours agreed upon conflict of interest. External work must be of such a nature and conducted in such a manner

  18. Annual energy review 2003

    SciTech Connect (OSTI)

    none,

    2004-09-30T23:59:59.000Z

    The Annual Energy Review 2003 is a statistical history of energy activities in the United States in modern times. Data are presented for all major forms of energy by production (extraction of energy from the earth, water, and other parts of the environment), consumption by end-user sector, trade with other nations, storage changes, and pricing. Much of the data provided covers the fossil fuels—coal, petroleum, and natural gas. Fossil fuels are nature’s batteries; they have stored the sun’s energy over millennia past. It is primarily that captured energy that we are drawing on today to fuel the activities of the modern economy. Data in this report measure the extraordinary expansion of our use of fossil fuels from 29 quadrillion British thermal units (Btu) in 1949 to 84 quadrillion Btu in 2003. In recent years, fossil fuels accounted for 86 percent of all energy consumed in the United States. This report also records the development of an entirely new energy industry—the nuclear electric power industry. The industry got its start in this country in 1957 when the Shippingport, Pennsylvania, nuclear electric power plant came on line. Since that time, the industry has grown to account for 20 percent of our electrical output and 8 percent of all energy used in the country. Renewable energy is a third major category of energy reported in this volume. Unlike fossil fuels, which are finite in supply, renewable energy is essentially inexhaustible because it can be replenished. Types of energy covered in the renewable category include conventional hydroelectric power, which is power derived from falling water; wood; waste; alcohol fuels; geothermal; solar; and wind. Together, these forms of energy accounted for about 6 percent of all U.S. energy consumption in recent years.

  19. Annual energy review 1997

    SciTech Connect (OSTI)

    NONE

    1998-07-01T23:59:59.000Z

    The Annual Energy Review (AER) is a historical data report that tells many stories. It describes, in numbers, the changes that have occurred in US energy markets since the midpoint of the 20th century. In many cases, those markets differ vastly from those of a half-century ago. By studying the graphs and data tables presented in this report, readers can learn about past energy supply and usage in the United States and gain an understanding of the issues in energy and the environment now before use. While most of this year`s report content is similar to last year`s, there are some noteworthy developments. Table 1.1 has been restructured into more summarized groupings -- fossil fuels, nuclear electric power, and renewable energy -- to aid analysts in their examination of the basic trends in those broad categories. Readers` attention is also directed to the electricity section, where considerable reformatting of the tables and graphs has been carried out to help clarify past and recent trends in the electric power industry as it enters a period of radical restructuring. Table 9.1, which summarizes US nuclear generating units, has been redeveloped to cover the entire history of the industry in this country and to provide categories relevant in assessing the future of the industry, such as the numbers of ordered generating units that have been canceled and those that were built and later shut down. In general, the AER emphasizes domestic energy statistics. Sections 1 through 10 and Section 12 are devoted mostly to US data; Section 11 reports on international statistics and world totals. 140 figs., 141 tabs.

  20. C:\\ANNUAL\\Vol2chps.v8\\ANNUAL2.VP

    U.S. Energy Information Administration (EIA) Indexed Site

    Natural Gas Annual. 1979: EIA, Natural Gas Production and Consumption, 1979. 1980-1994: EIA, Form EIA-176, "Annual Report of Natural and Supplemental Gas Supply and Disposi-...

  1. C:\\ANNUAL\\Vol2chps.v8\\ANNUAL2.VP

    U.S. Energy Information Administration (EIA) Indexed Site

    168 Energy Information Administration Historical Natural Gas Annual 1930 Through 2000 Energy Information Administration Historical Natural Gas Annual 1930 Through 2000 Energy...

  2. C:\\ANNUAL\\Vol2chps.v8\\ANNUAL2.VP

    U.S. Energy Information Administration (EIA) Indexed Site

    62 Energy Information Administration Historical Natural Gas Annual 1930 Through Energy Information Administration Historical Natural Gas Annual 1930 Through 1 8. Movements of...

  3. C:\\ANNUAL\\Vol2chps.v8\\ANNUAL2.VP

    U.S. Energy Information Administration (EIA) Indexed Site

    134 Energy Information Administration Historical Natural Gas Annual 1930 Through 1999 Energy Information Administration Historical Natural Gas Annual 1930 Through 2000 13....

  4. Annual Site Environmental Reports (ASER) | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Annual Site Environmental Reports (ASER) Annual Site Environmental Reports (ASER) Annual Site Environmental Reports (ASERs) are required by DOE O 231.1B. The ASERs provide...

  5. Vehicle Technologies Office: 2010 Propulsion Materials R&D Annual...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    0 Propulsion Materials R&D Annual Progress Report Vehicle Technologies Office: 2010 Propulsion Materials R&D Annual Progress Report 2010 annual progress report focusing on enabling...

  6. Vehicle Technologies Office: 2011 Propulsion Materials R&D Annual...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Vehicle Technologies Office: 2011 Propulsion Materials R&D Annual Progress Report Vehicle Technologies Office: 2011 Propulsion Materials R&D Annual Progress Report 2011 annual...

  7. 2013 Annual Merit Review Results Report - Hybrid Vehicle Systems...

    Broader source: Energy.gov (indexed) [DOE]

    2013 Annual Merit Review Results Report 2012 Annual Merit Review Results Report - Hybrid Vehicle Systems Technologies 2012 Annual Merit Review Results Report - Introduction...

  8. Title I Disposal Sites Annual Report | Department of Energy

    Office of Environmental Management (EM)

    Sites Annual Report 2013 Annual Site Inspection and Monitoring Report for Uranium Mill Tailings Radiation Control Act Title I Disposal Sites (March 2014) 2013 Annual Site...

  9. On the possibility of blue tensor spectrum within single field inflation

    E-Print Network [OSTI]

    Yi-Fu Cai; Jinn-Ouk Gong; Shi Pi; Emmanuel N. Saridakis; Shang-Yu Wu

    2014-12-23T23:59:59.000Z

    We present a series of theoretical constraints on the potentially viable inflation models that might yield a blue spectrum for primordial tensor perturbations. By performing a detailed dynamical analysis we show that, while there exists such possibility, the corresponding phase space is strongly bounded. Our result implies that, in order to achieve a blue tilt for inflationary tensor perturbations, one may either construct a non-canonical inflation model delicately, or study the generation of primordial tensor modes beyond the standard scenario of single slow-roll field.

  10. Sustainability of multi-field inflation and bound on string scale

    E-Print Network [OSTI]

    Jinn-Ouk Gong

    2009-02-11T23:59:59.000Z

    We study the effects of the interaction terms between the inflaton fields on the inflationary dynamics in multi-field models. With power law type potential and interactions, the total number of e-folds may get considerably reduced and can lead to unacceptably short period of inflation. Also we point out that this can place a bound on the characteristic scale of the underlying theory such as string theory. Using a simple multi-field chaotic inflation model from string theory, the string scale is constrained to be larger than the scale of grand unified theory.

  11. The effects of a fast-turning trajectory in multiple-field inflation

    E-Print Network [OSTI]

    Maciej Konieczka; Raquel H. Ribeiro; Krzysztof Turzynski

    2014-08-27T23:59:59.000Z

    The latest results from PLANCK impose strong constraints on features in the spectrum of the curvature perturbations from inflation. We analyse the possibility of particle production induced by sharp turns of the trajectory in field space in inflation models with multiple fields. Although the evolution of the background fields can be altered by particle production, we find rather modest changes in the power spectrum even for the most extreme case in which the entire kinetic energy of the scalar fields is converted into particles.

  12. Generation of large-scale magnetic fields from inflation in teleparallelism

    SciTech Connect (OSTI)

    Bamba, Kazuharu [Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Nagoya 464-8602 (Japan); Geng, Chao-Qiang; Luo, Ling-Wei, E-mail: bamba@kmi.nagoya-u.ac.jp, E-mail: geng@phys.nthu.edu.tw, E-mail: d9622508@oz.nthu.edu.tw [Department of Physics, National Tsing Hua University, Hsinchu, 300, Taiwan (China)

    2012-10-01T23:59:59.000Z

    We explore the generation of large-scale magnetic fields from inflation in teleparallelism, in which the gravitational theory is described by the torsion scalar instead of the scalar curvature in general relativity. In particular, we examine the case that the conformal invariance of the electromagnetic field during inflation is broken by a non-minimal gravitational coupling between the torsion scalar and the electromagnetic field. It is shown that for a power-law type coupling, the magnetic field on 1 Mpc scale with its strength of ? 10{sup ?9} G at the present time can be generated.

  13. Towards multi-field D-brane inflation in a warped throat

    SciTech Connect (OSTI)

    Chen, Heng-Yu [Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, WI53706-1390 (United States); Gong, Jinn-Ouk [Instituut-Lorentz for Theoretical Physics, Universiteit Leiden, Niels Bohrweg 2, 2333 CA Leiden (Netherlands); Koyama, Kazuya [Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth PO1 3FX (United Kingdom); Tasinato, Gianmassimo, E-mail: hchen46@wisc.edu, E-mail: jgong@lorentz.leidenuniv.nl, E-mail: Kazuya.Koyama@port.ac.uk, E-mail: G.Tasinato@thphys.uni-heidelberg.de [Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 19, 69120, Heidelberg (Germany)

    2010-11-01T23:59:59.000Z

    We study the inflationary dynamics in a model of slow-roll inflation in warped throat. Inflation is realized by the motion of a D-brane along the radial direction of the throat, and at later stages instabilities develop in the angular directions. We closely investigate both the single field potential relevant for the slow-roll phase, and the full multi-field one including the angular modes which becomes important at later stages. We study the main features of the instability process, discussing its possible consequences and identifying the vacua towards which the angular modes are driven.

  14. Does the first chaotic inflation model in supergravity provide the best fit to the Planck data?

    E-Print Network [OSTI]

    Andrei Linde

    2015-01-17T23:59:59.000Z

    I describe the first model of chaotic inflation in supergravity, which was proposed by Goncharov and the present author in 1983. The inflaton potential of this model has a plateau-type behavior $V_{0} (1- {8\\over 3}\\, e^{-\\sqrt 6 |\\phi|})$ at large values of the inflaton field. This model predicts $n_{s} = 1-{2\\over N} \\approx 0.967$ and $r = {4\\over 3 N^{2}} \\approx 4 \\times 10^{{-4}}$, in good agreement with the Planck data. I propose a slight generalization of this model, which allows to describe not only inflation but also dark energy and supersymmetry breaking.

  15. Boom and Bust Inflation: A Graceful Exit via Compact Extra Dimensions

    SciTech Connect (OSTI)

    Brown, Adam R. [Physics Department, Columbia University, New York, New York 10027 (United States)

    2008-11-28T23:59:59.000Z

    A model of inflation is proposed in which compact extra dimensions allow a graceful exit without recourse to flat potentials or super-Planckian field values. Though bubbles of true vacuum are too sparse to uniformly reheat the Universe by colliding with each other, a compact dimension enables a single bubble to uniformly reheat by colliding with itself. This mechanism, which generates an approximately scale invariant perturbation spectrum, requires that inflation be driven by a bulk field, that vacuum decay be slow, and that the extra dimension be at least a hundred times larger than the false vacuum Hubble length.

  16. Monetary explanation of inflation: the experience of three major OPEC economies

    SciTech Connect (OSTI)

    Darrat, A.F.

    1985-08-01T23:59:59.000Z

    This paper analyzes and tests empirically the monetary explanation of inflation in the case of the moderate inflationary experience of three major OPEC economies over the last two decades. The estimated model takes into account the underlying money demand relationship, and pays careful attention to the model's lag specifications. The empirical results show that the monetary model of inflation adequately explains the inflationary process in each of the countries studied. These empirical results, furthermore, are econometrically valid insofar as they are not plagued with significant simultaneous-equation bias. In addition, the estimated equations are also found to exhibit structural stability over time. 39 references, 4 tables.

  17. Anisotropic Power-law Inflation: A counter example to the cosmic no-hair conjecture

    E-Print Network [OSTI]

    Jiro Soda

    2014-10-31T23:59:59.000Z

    It is widely believed that anisotropy in the expansion of the universe will decay exponentially fast during inflation. This is often referred to as the cosmic no-hair conjecture. However, we find a counter example to the cosmic no-hair conjecture in the context of supergravity. As a demonstration, we present an exact anisotropic power-law inflationary solution which is an attractor in the phase space. We emphasize that anisotropic inflation is quite generic in the presence of anisotropic sources which couple with an inflaton.

  18. Apparatus and method for mapping an area of interest

    DOE Patents [OSTI]

    Staab, Torsten A. (Los Alamos, NM) Cohen, Daniel L. (Ithaca, NY); Feller, Samuel (Fairfax, VA)

    2009-12-01T23:59:59.000Z

    An apparatus and method are provided for mapping an area of interest using polar coordinates or Cartesian coordinates. The apparatus includes a range finder, an azimuth angle measuring device to provide a heading and an inclinometer to provide an angle of inclination of the range finder as it relates to primary reference points and points of interest. A computer is provided to receive signals from the range finder, inclinometer and azimuth angle measurer to record location data and calculate relative locations between one or more points of interest and one or more primary reference points. The method includes mapping of an area of interest to locate points of interest relative to one or more primary reference points and to store the information in the desired manner. The device may optionally also include an illuminator which can be utilized to paint the area of interest to indicate both points of interest and primary points of reference during and/or after data acquisition.

  19. 2005-06 Annual Budget Instructions FY6/AppendixC.doc -1 -02-01-05

    E-Print Network [OSTI]

    Sheridan, Jennifer

    2005-06 Annual Budget Instructions FY6/AppendixC.doc - 1 - 02-01-05 A P P E N D I X C NUMERIC FUND;Office of Budget, Planning & Analysis FY6/AppendixC.doc - 2 - 02-01-05 NUMERIC CODE SOURCE DESCRIPTION; Principal Repayment, Interest, and Rebates #12;2005-06 Annual Budget Instructions FY6/AppendixC.doc - 3 - 02

  20. The Dunaliella salina organelle genomes: large sequences, inflated with intronic and intergenic DNA

    SciTech Connect (OSTI)

    Smith, David R.; Lee, Robert W.; Cushman, John C.; Magnuson, Jon K.; Tran, Duc; Polle, Juergen E.

    2010-05-07T23:59:59.000Z

    Abstract Background: Dunaliella salina Teodoresco, a unicellular, halophilic green alga belonging to the Chlorophyceae, is among the most industrially important microalgae. This is because D. salina can produce massive amounts of ?-carotene, which can be collected for commercial purposes, and because of its potential as a feedstock for biofuels production. Although the biochemistry and physiology of D. salina have been studied in great detail, virtually nothing is known about the genomes it carries, especially those within its mitochondrion and plastid. This study presents the complete mitochondrial and plastid genome sequences of D. salina and compares them with those of the model green algae Chlamydomonas reinhardtii and Volvox carteri. Results: The D. salina organelle genomes are large, circular-mapping molecules with ~60% noncoding DNA, placing them among the most inflated organelle DNAs sampled from the Chlorophyta. In fact, the D. salina plastid genome, at 269 kb, is the largest complete plastid DNA (ptDNA) sequence currently deposited in GenBank, and both the mitochondrial and plastid genomes have unprecedentedly high intron densities for organelle DNA: ~1.5 and ~0.4 introns per gene, respectively. Moreover, what appear to be the relics of genes, introns, and intronic open reading frames are found scattered throughout the intergenic ptDNA regions -- a trait without parallel in other characterized organelle genomes and one that gives insight into the mechanisms and modes of expansion of the D. salina ptDNA. Conclusions: These findings confirm the notion that chlamydomonadalean algae have some of the most extreme organelle genomes of all eukaryotes. They also suggest that the events giving rise to the expanded ptDNA architecture of D. salina and other Chlamydomonadales may have occurred early in the evolution of this lineage. Although interesting from a genome evolution standpoint, the D. salina organelle DNA sequences will aid in the development of a viable plastid transformation system for this model alga, and they will complement the forthcoming D. salina nuclear genome sequence, placing D. salina in a group of a select few photosynthetic eukaryotes for which complete genome sequences from all three genetic compartments are available.

  1. FY 1994 Annual Work Plan

    SciTech Connect (OSTI)

    Not Available

    1993-09-30T23:59:59.000Z

    In accordance with the Inspector General`s Strategic Planning Policy directive, the Office of Inspector General (OIG) annually updates its Strategic Plan with budgetary and program guidance for the next fiscal year. The program guidance identifies and establishes priorities for OIG coverage of important DOE issues and operations, provides the basis for assigning OIG resources, and is the source for issues covered in Assistant Inspectors General annual work plans. The Office of the Assistant Inspector General for Audits (AIGA) publishes an Annual Work Plan in September of each year. The plan includes the OIG program guidance and shows the commitment of resources necessary to accomplish the assigned work and meet our goals. The program guidance provides the framework within which the AIGA work will be planned and accomplished. Audits included in this plan are designed to help insure that the requirements of our stakeholders have been considered and blended into a well balanced audit program.

  2. Annual Report 2005-2006

    E-Print Network [OSTI]

    Cambridge University Library

    2006-01-01T23:59:59.000Z

    cambridge university library annual report 2005–2006 cambridge university library annual report 2005–2006 title page Reuben Ramble’s map of Cambridgeshire, produced for children in 1845. From the Map Department’s collections. right Grammar in rhyme... and Clinical Medicine, as well as a majority of departments in the School of Physical Sciences. Discussion took place during the year with all the Schools, with a view to extending the scheme to become a University-wide one. The Library bought the digitised...

  3. Annual Reports | Department of Energy

    Energy Savers [EERE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directed off Energy.gov. Are you0 ARRA NewslettersPartnership of the Americas |AnchorageAnnaofAnnualAnnual

  4. Annual Meetings | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE: Alternative Fuels DataEnergyDepartment ofATVMAgriculturalAn1 Annual FOIA Report for 2011Annual

  5. Nonproliferation Graduate Fellowship Program Annual Report: Class of 2011

    SciTech Connect (OSTI)

    McMakin, Andrea H.

    2012-08-20T23:59:59.000Z

    Annual report for the Nonproliferation Graduate Fellowship Program (NGFP), which PNNL administers for the National Nuclear Security Administration (NNSA). Features the Class of 2011. The NGFP is a NNSA program with a mission to cultivate future technical and policy leaders in nonproliferation and international security. Through the NGFP, outstanding graduate students with career interests in nonproliferation are appointed to program offices within the Office of Defense Nuclear Nonproliferation (DNN). During their one-year assignment, Fellows participate in programs designed to detect, prevent, and reverse the proliferation of nuclear weapons.

  6. Annual Review 2012 University of Surrey Annual Review 1

    E-Print Network [OSTI]

    Jones, Peter JS

    researchers are changing the world in vital fields such as safe water, sustainable energy, telecommunications Annual Review 32 of our research units are rated world-leading, internationally excellent, or recognised of Surrey nurtures a truly global outlook. Source: latest available Research Assessment Exercise data World

  7. 10 Annual report 2011 Annual report 2011 11

    E-Print Network [OSTI]

    of shared platforms that will enable a measurement of the impact of climate change and the exploitation the world Working in partnership #12;12 Annual report 2011 ContaCt: geostrategie@ird.fr MEdItErranEan rEgIon Despite the dramatic events at the start of 2011 in the southern Mediterranean, several agreements were

  8. Annual Security Report October 1, 2013

    E-Print Network [OSTI]

    Yates, Andrew

    ® Annual Security Report October 1, 2013 Albert Einstein College of Medicine Jack & Pearl Resnick Campus Bronx, NY #12;2 | P a g e TABLE OF CONTENTS ABOUT THE ANNUAL SECURITY REPORT ................................................................................................4 MESSAGE FROM THE EINSTEIN SECURITY DEPARTMENT

  9. Annual Security Report October 1, 2012

    E-Print Network [OSTI]

    Yates, Andrew

    ® Annual Security Report October 1, 2012 Albert Einstein College of Medicine Jack & Pearl Resnick Campus Bronx, NY #12;2 | P a g e TABLE OF CONTENTS ABOUT THE ANNUAL SECURITY REPORT ................................................................................................3 MESSAGE FROM THE SECURITY DEPARTMENT

  10. 1999 AERA Annual Meeting Montreal, Quebec, Canada

    E-Print Network [OSTI]

    Larkin, Teresa L.

    1999 AERA Annual Meeting Montreal, Quebec, Canada 1 Evaluating the Effectiveness of On styles. #12;1999 AERA Annual Meeting Montreal, Quebec, Canada 2 Method: This study was initiated to allow

  11. Deleware Water Resources Center Annual Technical Report

    E-Print Network [OSTI]

    of best management practices (BMPs) by private businesses, and improved storm water management & wetlandsDeleware Water Resources Center Annual Technical Report FY 2002 Introduction Delaware Water Resources Center Annual Technical Report Introduction and Program Management/Administration Description FY

  12. Danish Polymer Centre Annual Report 2002

    E-Print Network [OSTI]

    Danish Polymer Centre Annual Report 2002 #12;2 The Danish Polymer Centre, DTU and Risø Annual.1 Polymer based solar cells (photovoltaics) ................................ 5 2.2 Structuring Plastic ........................................................................ 17 2.7 Biodegradable polymer composites .......................................... 19 2

  13. Sound Waves Excitation by Jet-Inflated Bubbles in Clusters of Galaxies

    E-Print Network [OSTI]

    Assaf Sternberg; Noam Soker

    2008-08-17T23:59:59.000Z

    We show that repeated sound waves in the intracluster medium (ICM) can be excited by a single inflation episode of an opposite bubble pair. To reproduce this behavior in numerical simulations the bubbles should be inflated by jets, rather than being injected artificially. The multiple sound waves are excited by the motion of the bubble-ICM boundary that is caused by vortices inside the inflated bubbles and the backflow (`cocoon') of the ICM around the bubble. These sound waves form a structure that can account for the ripples observed in the Perseus cooling flow cluster. We inflate the bubbles using slow massive jets, with either a wide opening angle or that are precessing. The jets are slow in the sense that they are highly sub-relativistic, $v_j \\sim 0.01c-0.1c$, and they are massive in the sense that the pair of bubbles carry back to the ICM a large fraction of the cooling mass, i.e., $\\sim 1-50 M_\\odot \\yr^{-1}$. We use a two-dimensional axisymmetric (referred to as 2.5D) hydrodynamical numerical code (VH-1).

  14. MultiModeCode: An efficient numerical solver for multifield inflation

    E-Print Network [OSTI]

    Layne C. Price; Jonathan Frazer; Jiajun Xu; Hiranya V. Peiris; Richard Easther

    2014-10-02T23:59:59.000Z

    We present MultiModeCode, a Fortran 95/2000 package for the numerical exploration of multifield inflation models. This program facilitates efficient Monte Carlo sampling of prior probabilities for inflationary model parameters and initial conditions and is the first publicly available code that can efficiently generate large sample-sets for inflation models with $\\mathcal O(100)$ fields. The code numerically solves the equations of motion for the background and first-order perturbations of multi-field inflation models with canonical kinetic terms and arbitrary potentials, providing the adiabatic, isocurvature, and tensor power spectra at the end of inflation. For models with sum-separable potentials MultiModeCode also computes the slow-roll prediction via the $\\delta N$ formalism for easy model exploration and validation. We pay particular attention to the isocurvature perturbations as the system approaches the adiabatic limit, showing how to avoid numerical instabilities that affect some other approaches to this problem. We demonstrate the use of MultiModeCode by exploring a few toy models. Finally, we give a concise review of multifield perturbation theory and a user's manual for the program.

  15. Multi-field open inflation model and multi-field dynamics in tunneling

    SciTech Connect (OSTI)

    Sugimura, Kazuyuki; Yamauchi, Daisuke; Sasaki, Misao, E-mail: sugimura@yukawa.kyoto-u.ac.jp, E-mail: yamauchi@icrr.u-tokyo.ac.jp, E-mail: misao@yukawa.kyoto-u.ac.jp [Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto (Japan)

    2012-01-01T23:59:59.000Z

    We consider a multi-field open inflation model, in which one of the fields dominates quantum tunneling from a false vacuum while the other field governs slow-roll inflation within the bubble nucleated from false vacuum decay. We call the former the tunneling field and the latter the inflaton field. In the limit of a negligible interaction between the two fields, the false vacuum decay is described by a Coleman-De Luccia instanton. Here we take into account the coupling between the two fields and construct explicitly a multi-field instanton for a simple quartic potential model. We also solve the evolution of the scalar fields within the bubble. We find our model realizes open inflation successfully. This is the first concrete, viable model of open inflation realized with a simple potential. We then study the effect of the multi-field dynamics on the false vacuum decay, specifically on the tunneling rate. We find the tunneling rate increases in general provided that the multi-field effect can be treated perturbatively.

  16. False vacuum energy dominated inflation with large $r$ and the importance of $?_s$

    E-Print Network [OSTI]

    Stefan Antusch; Francesco Cefala; David Nolde; Stefano Orani

    2014-10-22T23:59:59.000Z

    We investigate to which extent and under which circumstances false vacuum energy ($V_0$) dominated slow-roll inflation is compatible with a large tensor-to-scalar ratio $r = O(0.1)$, as indicated by the recent BICEP2 measurement. With $V_0$ we refer to a constant contribution to the inflaton potential, present before a phase transition takes place and absent in the true vacuum of the theory, like e.g. in hybrid inflation. Based on model-independent considerations, we derive an upper bound on the possible amount of $V_0$ domination and highlight the importance of higher-order runnings of the scalar spectral index (beyond $\\alpha_s$) in order to realise scenarios of $V_0$ dominated inflation. We study the conditions for $V_0$ domination explicitly with an inflaton potential reconstruction around the inflaton field value 50 e-folds before the end of inflation, taking into account the present observational data. To this end, we provide the up-to-date parameter constraints within $\\Lambda$CDM + $r$ + $\\alpha_s$ + $\\kappa_s$ using the cosmological parameter estimation code Monte Python together with the Boltzmann code CLASS.

  17. Fluid transport in branched structures with temporary closures: A model for quasistatic lung inflation

    E-Print Network [OSTI]

    Alencar, Adriano Mesquita

    Fluid transport in branched structures with temporary closures: A model for quasistatic lung a model system relevant to the inflation of a mammalian lung, an asymmetric bifurcating structure description of the underlying branching structure of the lung, by analyzing experimental pressure-volume data

  18. Interfacial Chemistry and Engineering Annual Report 2000

    SciTech Connect (OSTI)

    Grate, Jay W.

    2001-08-01T23:59:59.000Z

    This annual report describes the research and staff accomplishments in 2000 for the EMSL Interfacial Chemistry and Engineering Directorate.

  19. Electric power annual 1994. Volume 1

    SciTech Connect (OSTI)

    NONE

    1995-07-21T23:59:59.000Z

    The Electric Power Annual presents a summary of electric power industry statistics at national, regional, and State levels.

  20. Monthly/Annual Energy Review - electricity section

    Reports and Publications (EIA)

    2015-01-01T23:59:59.000Z

    Monthly and latest annual statistics on electricity generation, capacity, end-use, fuel use and stocks, and retail price.