Entropy production and curvature perturbation from dissipative curvatons

doi:https://doi.org/10.1088/1475-7516/2010/09/006

Title: Entropy production and curvature perturbation from dissipative curvatons

Full Record
Other Related Research

Abstract

Considering the curvaton field that follows dissipative slow-roll equation, we show that the field can lead to entropy production and generation of curvature perturbation after reheating. Spectral index is calculated to discriminate warm and thermal scenarios of dissipative curvatons from the standard curvaton model. In contrast to the original curvaton model, quadratic potential is not needed in the dissipative scenario, since the growth in the oscillating period is not essential for the model.

Authors:

Matsuda, Tomohiro ^[1]

Laboratory of Physics, Saitama Institute of Technology, Fusaiji, Okabe-machi, Saitama 369-0293 (Japan)

Publication Date:: 2010-09-01

OSTI Identifier:: 22275420

Resource Type:: Journal Article

Journal Name:: Journal of Cosmology and Astroparticle Physics

Additional Journal Information:: Journal Volume: 2010; Journal Issue: 09; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGICAL MODELS; COSMOLOGY; DISTURBANCES; ENTROPY; FIELD EQUATIONS; INDEXES; POTENTIALS

Citation Formats


                    Matsuda, Tomohiro. Entropy production and curvature perturbation from dissipative curvatons.  United States: N. p., 2010. 
        Web.  doi:10.1088/1475-7516/2010/09/006.

Copy to clipboard


                    Matsuda, Tomohiro. Entropy production and curvature perturbation from dissipative curvatons.  United States.  https://doi.org/10.1088/1475-7516/2010/09/006

Copy to clipboard


                    Matsuda, Tomohiro. Wed .  
        "Entropy production and curvature perturbation from dissipative curvatons".  United States.  https://doi.org/10.1088/1475-7516/2010/09/006.

Copy to clipboard


                    
@article{osti_22275420,

  title        = {Entropy production and curvature perturbation from dissipative curvatons},

  author       = {Matsuda, Tomohiro},

  abstractNote = {Considering the curvaton field that follows dissipative slow-roll equation, we show that the field can lead to entropy production and generation of curvature perturbation after reheating. Spectral index is calculated to discriminate warm and thermal scenarios of dissipative curvatons from the standard curvaton model. In contrast to the original curvaton model, quadratic potential is not needed in the dissipative scenario, since the growth in the oscillating period is not essential for the model.},

  doi          = {10.1088/1475-7516/2010/09/006},

  url          = {https://www.osti.gov/biblio/22275420},
  journal      = {Journal of Cosmology and Astroparticle Physics},

  issn         = {1475-7516},

  number       = 09,

  volume       = 2010,

  place        = {United States},

  year         = {2010},

  month        = {9}

}

Copy to clipboard

Journal Article:

https://doi.org/10.1088/1475-7516/2010/09/006

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

BICEP2, the curvature perturbation and supersymmetry

Journal Article Lyth, David H., E-mail: d.lyth@lancaster.ac.uk - Journal of Cosmology and Astroparticle Physics

The tensor fraction r ≅ 0.16 found by BICEP2 corresponds to a Hubble parameter H ≅ 1.0 × 10{sup 14} GeV during inflation. This has two implications for the (single-field) slow-roll inflation hypothesis. First, the inflaton perturbation must account for much more than 10% of the curvature perturbation ζ, which barring fine-tuning means that it accounts for practically all of it. It follows that a curvaton-like mechanism for generating ζ requires an alternative to slow roll such as k-inflation. Second, accepting slow-roll inflation, the excursion of the inflaton field is at least of order Planck scale. As a result, the flatness of the inflaton presumably requiresmore »« less
https://doi.org/10.1088/1475-7516/2014/11/003
Primordial curvature fluctuation and its non-Gaussianity in models with modulated reheating

Journal Article Ichikawa, Kazuhide ; Suyama, Teruaki ; Takahashi, Tomo ; ... - Physical Review. D, Particles Fields

We investigate non-Gaussianity in the modulated reheating scenario where fluctuations of the decay rate of the inflaton generate adiabatic perturbations, paying particular attention to the nonlinearity (NL) parameters f{sub NL}, {tau}{sub NL}, and g{sub NL} as well as the scalar spectral index and tensor-to-scalar ratio which characterize the nature of the primordial power spectrum. We also take into account the preexisting adiabatic perturbations produced from the inflaton fluctuations. It has been known that the nonlinearity between the curvature perturbations and the fluctuations of the decay rate can yield non-Gaussianity at the level of f{sub NL}{approx}O(1), but we find that themore »« less
https://doi.org/10.1103/PHYSREVD.78.063545
Curvature and isocurvature perturbations from two-field inflation in a slow-roll expansion

Journal Article Byrnes, Christian T ; Wands, David - Physical Review. D, Particles Fields

We calculate the power spectra of primordial curvature and isocurvature perturbations from a general two-field inflation model at next-to-leading order correction in a slow-roll expansion. In particular we calculate the spectral indices to second order in slow-roll parameters. We show that the cross correlation of the curvature and isocurvature perturbations at the time of Hubble exit during inflation is nonzero at first order in slow-roll parameters. We apply our results to different classes of inflation, including inflaton and curvaton scenarios. The spectrum of primordial gravitational waves, curvature and isocurvature perturbations obey generalized consistency relations in two-field inflation models. We givemore »« less
https://doi.org/10.1103/PHYSREVD.74.043529
Primordial non-Gaussianity from mixed inflaton-curvaton perturbations

Journal Article Fonseca, José ; Wands, David - Journal of Cosmology and Astroparticle Physics

We characterise the primordial perturbations produced due to both inflaton and curvaton fluctuations in models where the curvaton has a quadratic, cosine or hyperbolic potential, and the inflaton potential is characterised by the usual slow-roll parameters. Isocurvature curvaton field perturbations can produce significant non-Gaussianity in the primordial density field, in contrast with adiabatic inflaton field perturbations which produce negligible non-Gaussianity for canonical scalar fields. A non-self-interacting curvaton with quadratic potential produces a local-type non-Gaussianity that is well described by the non-linearity parameter f{sub NL}, which may be scale-dependent when the inflaton perturbations dominate the power spectrum. We show how observationalmore »« less
https://doi.org/10.1088/1475-7516/2012/06/028
Curvatons and inhomogeneous scenarios with deviation from slow-roll

Journal Article Matsuda, Tomohiro - Journal of Cosmology and Astroparticle Physics

The spectral index is studied at the point where scalar fields deviate from slow-roll during inflation. Considering the deviation, which may cause a significant difference in the time derivative of the Hubble parameter and also in the terms in the evolution equation, we show how the deviation affects the spectral index of the curvature perturbations. Considering conventional inflation, curvatons and other inhomogeneous scenarios as mechanisms for generating the cosmological perturbation, we examine whether the spectral index induced by the deviation from the standard slow-roll can explain the spectral index n-1>0 at k = 0.002 Mpc{sup -1} while keeping n-1<0 atmore » a smaller scale.« less
https://doi.org/10.1088/1475-7516/2008/12/001

Similar Records