Primordial non-Gaussianities of general multiple-field inflation
文献类型：期刊论文
| 作者 | Gao, Xian; Gao, X , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China |
| 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 |
| ISSN号 | 1475-7516 |
| 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. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| WOS记录号 | WOS:000257339800005 |
| 公开日期 | 2012-08-02 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/5530]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 通讯作者 | Gao, X , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China |
| 推荐引用方式 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):-. |
入库方式： OAI收割
来源：理论物理研究所
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