Constraining the break of spatial diffeomorphism invariance with Planck data
Abstract
The current most accepted paradigm for the early universe cosmology, the inflationary scenario, shows a good agreement with the recent Cosmic Microwave Background (CMB) and polarization data. However, when the inflation consistency relation is relaxed, these observational data exclude a larger range of red tensor tilt values, prevailing the blue ones which are not predicted by the minimal inflationary models. Recently, it has been shown that the assumption of spatial diffeomorphism invariance breaking (SDB) in the context of an effective field theory of inflation leads to interesting observational consequences. Among them, the possibility of generating a blue tensor spectrum, which can recover the specific consistency relation of the String Gas Cosmology, for a certain choice of parameters. We use the most recent CMB data to constrain the SDB model and test its observational viability through a Bayesian analysis assuming as reference an extended ΛCDM+tensor perturbation model, which considers a powerlaw tensor spectrum parametrized in terms of the tensortoscalar ratio, r , and the tensor spectral index, n {sub t} . If the inflation consistency relation is imposed, r =−8 n {sub t} , we obtain a strong evidence in favor of the reference model whereas if such relation is relaxed,more »
 Authors:
 Departamento de Astronomia, Observatório Nacional, R. Gen. José Cristino, 77—São Cristóvão, 20921400, Rio de Janeiro, RJ (Brazil)
 Publication Date:
 OSTI Identifier:
 22676113
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2017; Journal Issue: 07; Other Information: Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPARATIVE EVALUATIONS; COSMIC GASES; COSMOLOGY; DISTURBANCES; FIELD THEORIES; INVARIANCE PRINCIPLES; PERTURBATION THEORY; POLARIZATION; RELICT RADIATION; SPECTRA; UNIVERSE
Citation Formats
Graef, L.L., Benetti, M., and Alcaniz, J.S., Email: leilagraef@on.br, Email: micolbenetti@on.br, Email: alcaniz@on.br. Constraining the break of spatial diffeomorphism invariance with Planck data. United States: N. p., 2017.
Web. doi:10.1088/14757516/2017/07/013.
Graef, L.L., Benetti, M., & Alcaniz, J.S., Email: leilagraef@on.br, Email: micolbenetti@on.br, Email: alcaniz@on.br. Constraining the break of spatial diffeomorphism invariance with Planck data. United States. doi:10.1088/14757516/2017/07/013.
Graef, L.L., Benetti, M., and Alcaniz, J.S., Email: leilagraef@on.br, Email: micolbenetti@on.br, Email: alcaniz@on.br. Sat .
"Constraining the break of spatial diffeomorphism invariance with Planck data". United States.
doi:10.1088/14757516/2017/07/013.
@article{osti_22676113,
title = {Constraining the break of spatial diffeomorphism invariance with Planck data},
author = {Graef, L.L. and Benetti, M. and Alcaniz, J.S., Email: leilagraef@on.br, Email: micolbenetti@on.br, Email: alcaniz@on.br},
abstractNote = {The current most accepted paradigm for the early universe cosmology, the inflationary scenario, shows a good agreement with the recent Cosmic Microwave Background (CMB) and polarization data. However, when the inflation consistency relation is relaxed, these observational data exclude a larger range of red tensor tilt values, prevailing the blue ones which are not predicted by the minimal inflationary models. Recently, it has been shown that the assumption of spatial diffeomorphism invariance breaking (SDB) in the context of an effective field theory of inflation leads to interesting observational consequences. Among them, the possibility of generating a blue tensor spectrum, which can recover the specific consistency relation of the String Gas Cosmology, for a certain choice of parameters. We use the most recent CMB data to constrain the SDB model and test its observational viability through a Bayesian analysis assuming as reference an extended ΛCDM+tensor perturbation model, which considers a powerlaw tensor spectrum parametrized in terms of the tensortoscalar ratio, r , and the tensor spectral index, n {sub t} . If the inflation consistency relation is imposed, r =−8 n {sub t} , we obtain a strong evidence in favor of the reference model whereas if such relation is relaxed, a weak evidence in favor of the model with diffeomorphism breaking is found. We also use the same CMB data set to make an observational comparison between the SDB model, standard inflation and String Gas Cosmology.},
doi = {10.1088/14757516/2017/07/013},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 07,
volume = 2017,
place = {United States},
year = {Sat Jul 01 00:00:00 EDT 2017},
month = {Sat Jul 01 00:00:00 EDT 2017}
}

Standard inflationary models yield a characteristic signature of a primordial power spectrum with a red tensor and scalar tilt. Nevertheless, Cannone et al. [1] recently suggested that, by breaking the assumption of spatial diffeomorphism invariance in the context of the effective field theory of inflation, a blue tensor spectrum can be achieved without violating the Null Energy Condition. In this context, we explore in which cases the inflationary model of [2] can yield a blue tilt of the tensor modes along with a red tilt in the scalar spectrum. Ultimately, we analyze under which conditions the model of [3] canmore »

Prospects for constraining neutrino mass using Planck and Lyman{alpha} forest data
In this paper we investigate how well Planck and Lyman{alpha} forest data will be able to constrain the sum of the neutrino masses, and thus, in conjunction with flavor oscillation experiments, be able to determine the absolute masses of the neutrinos. It seems possible that Planck, together with a Lyman{alpha} survey, will be able to put pressure on an inverted hierarchial model for the neutrino masses. However, even for optimistic assumptions of the precision of future Lyman{alpha} data sets, it will not be possible to confirm a minimalmass normal hierarchy. 
Constraining models of f(R) gravity with Planck and WiggleZ power spectrum data
In order to explain cosmic acceleration without invoking ''dark'' physics, we consider f(R) modified gravity models, which replace the standard EinsteinHilbert action in General Relativity with a higher derivative theory. We use data from the WiggleZ Dark Energy survey to probe the formation of structure on large scales which can place tight constraints on these models. We combine the largescale structure data with measurements of the cosmic microwave background from the Planck surveyor. After parameterizing the modification of the action using the Compton wavelength parameter B{sub 0}, we constrain this parameter using ISiTGR, assuming an initial noninformative log prior probabilitymore » 
Constraining the evolution of the CMB temperature with SZ measurements from Planck data
The CMB temperatureredshift relation, T{sub CMB}(z)=T{sub 0}(1+z), is a key prediction of the standard cosmology but is violated in many nonstandard models. Constraining possible deviations from this law is an effective way to test the ΛCDM paradigm and to search for hints of new physics. We have determined T{sub CMB}(z), with a precision up to 3%, for a subsample (103 clusters) of the Planck SZ cluster catalog, at redshifts in the range 0.01–0.94, using measurements of the spectrum of the SunyaevZel'dovich (SZ) effect obtained from Planck temperature maps at frequencies from 70 to 353 GHz. The method adopted to providemore » 
Quantum effective action in spacetimes with branes and boundaries: Diffeomorphism invariance
We construct a gaugefixing procedure in the path integral for gravitational models with branes and boundaries. This procedure incorporates a set of gauge conditions which gauge away effectively decoupled diffeomorphisms acting in the (d+1)dimensional bulk and on the ddimensional brane. The corresponding gaugefixing factor in the path integral factorizes as a product of the bulk and brane (surfacetheory) factors. This factorization underlies a special bulk wave function representation of the brane effective action. We develop the semiclassical expansion for this action and explicitly derive it in the oneloop approximation. The oneloop brane effective action can be decomposed into the summore »