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题名: Inflationary non-Gaussianity from thermal fluctuations
作者: Chen, Bin ;  Wang, Yi ;  Xue, Wei
刊名: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
出版日期: 2008
期号: 5, 页码:-
关键词: ANGULAR POWER SPECTRUM ;  PROBE WMAP OBSERVATIONS ;  COSMOLOGICAL PARAMETERS ;  UNIVERSE SCENARIO ;  K-INFLATION ;  PERTURBATIONS ;  ANISOTROPY ;  RADIATION ;  SYMMETRY ;  BREAKING
学科分类: Physics
通讯作者: Chen, B , Peking Univ, Dept Phys, Beijing 100871, Peoples R China
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
英文摘要: 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).
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000257167500014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5547
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Chen, Bin,Wang, Yi,Xue, Wei. Inflationary non-Gaussianity from thermal fluctuations[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2008(5):-.
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