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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
Source PublicationJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Keyword3-point Correlation-function Cosmic-string Production Slow-roll Expansion 2nd-order Corrections Power Spectrum K-inflation Axion Field Perturbations Cosmology Universe
AbstractWe 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.
2008
ISSN1475-7516
Issue6Pages:-
Subject AreaPhysics
Indexed BySCI
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Cited Times:51[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/5530
Collection理论物理所科研产出_SCI论文
Corresponding AuthorGao, X , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
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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