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Chen, Bin; Wang, Yi; Xue, Wei; Chen, B , Peking Univ, Dept Phys, Beijing 100871, Peoples R China
Inflationary non-Gaussianity from thermal fluctuations
KeywordAngular Power Spectrum Probe Wmap Observations Cosmological Parameters Universe Scenario K-inflation Perturbations Anisotropy Radiation Symmetry Breaking
AbstractWe calculate the contribution of fluctuations with a thermal origin to the inflationary non-Gaussianity. We find that even a small component of radiation can lead to a large non-Gaussianity. We show that this thermal non-Gaussianity always has positive f(NL). We illustrate our result in the chain inflation model and the very weakly dissipative warm inflation model. We show that f(NL) similar to O(1) is general in such models. If we allow a modified equation of state, or some decoupling effects, a large thermal non-Gaussianity of order f(NL) > 5 or even f(NL) similar to 100 can be produced. We also show that the power spectrum of chain inflation should have a thermal origin. In the appendix, we give a clarification on the different conventions used in the literature related to the calculation of f(NL).
Subject AreaPhysics
Indexed BySCI
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Cited Times:33[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorChen, B , Peking Univ, Dept Phys, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Chen, Bin,Wang, Yi,Xue, Wei,et al. Inflationary non-Gaussianity from thermal fluctuations[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2008(5):-.
APA Chen, Bin,Wang, Yi,Xue, Wei,&Chen, B , Peking Univ, Dept Phys, Beijing 100871, Peoples R China.(2008).Inflationary non-Gaussianity from thermal fluctuations.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(5),-.
MLA Chen, Bin,et al."Inflationary non-Gaussianity from thermal fluctuations".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .5(2008):-.
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