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题名: Primordial non-Gaussianities of general multiple-field inflation
作者: Gao, Xian
刊名: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
出版日期: 2008
期号: 6, 页码:-
关键词: 3-POINT CORRELATION-FUNCTION ;  COSMIC-STRING PRODUCTION ;  SLOW-ROLL EXPANSION ;  2ND-ORDER CORRECTIONS ;  POWER SPECTRUM ;  K-INFLATION ;  AXION FIELD ;  PERTURBATIONS ;  COSMOLOGY ;  UNIVERSE
学科分类: Physics
通讯作者: Gao, X , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
部门归属: [Gao, X] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; [Gao, X] Univ Sci & Technol China, Interdisciplinary Ctr Theoret Study, Hefei 230027, Anhui, Peoples R China
英文摘要: We perform a general study of the primordial scalar non-Gaussianities in multi-field inflationary models in Einstein gravity. We consider models governed by a Lagrangian which is a general function of the scalar fields and their first-order spacetime derivatives. We use delta N formalism to relate scalar fields and the curvature perturbations. We calculate the explicit cubic order perturbative action and the three-point function of curvature perturbation evaluated at the horizon crossing. Under reasonable assumptions, in the small slowly varying parameters limit and with a sound speed c(s) close to one, we find that the non-Gaussianity is completely determined by these slowly varying parameters and some other parameters which are determined by the structure of the inflationary model. Our work generalizes previous results, and implies the possibility of the existence of large non-Gaussianity in model constructing, and it would be also useful to study the non-Gaussianity in multi-field inflationary models which will be constructed in the future.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000257339800005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5530
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Gao, Xian. Primordial non-Gaussianities of general multiple-field inflation[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2008(6):-.
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