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Inflationary non-Gaussianity from thermal fluctuations
Chen, Bin; Wang, Yi; Xue, Wei; Chen, B , Peking Univ, Dept Phys, Beijing 100871, Peoples R China
2008
发表期刊JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
ISSN1475-7516
期号5页码:-
摘要We 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).
部门归属[Chen, B; Xue, W] Peking Univ, Dept Phys, Beijing 100871, Peoples R China; [Wang, Y] Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China; [Wang, Y] Univ Sci & Technol China, Interdisciplinary Ctr Theoret Study, Hefei 230027, Anhui, Peoples R China
关键词Angular Power Spectrum Probe Wmap Observations Cosmological Parameters Universe Scenario K-inflation Perturbations Anisotropy Radiation Symmetry Breaking
学科领域Physics
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收录类别SCI
WOS记录号WOS:000257167500014
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被引频次:33[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/5547
专题理论物理所SCI论文
通讯作者Chen, B , Peking Univ, Dept Phys, Beijing 100871, Peoples R China
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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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