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Primordial non-Gaussianities of general multiple-field inflation
Gao, Xian; Gao, X , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
2008
发表期刊JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
ISSN1475-7516
期号6页码:-
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.
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
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
学科领域Physics
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收录类别SCI
WOS记录号WOS:000257339800005
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被引频次:50[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/311006/5530
专题理论物理所SCI论文
通讯作者Gao, X , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
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Gao, Xian,Gao, X , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China. Primordial non-Gaussianities of general multiple-field inflation[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2008(6):-.
APA Gao, Xian,&Gao, X , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.(2008).Primordial non-Gaussianities of general multiple-field inflation.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(6),-.
MLA Gao, Xian,et al."Primordial non-Gaussianities of general multiple-field inflation".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .6(2008):-.
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