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Curvaton with nonminimal derivative coupling to gravity: Full perturbation analysis

文献类型：期刊论文

作者Feng, KX ; Qiu, TT
刊名PHYSICAL REVIEW D
出版日期2014
卷号90期号:12页码:123508
关键词NON-GAUSSIANITY INFLATION COSMOLOGY SCENARIO SCALAR
ISSN号1550-7998
通讯作者Feng, KX (reprint author), Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China.
英文摘要In our previous paper [K. Feng, T. Qiu, and Y.-S. Piao, Phys. Lett. B 729, 99 (2014)], we have shown a curvaton model where the curvaton has a nonminimal derivative coupling to gravity. Such a coupling could cause scale invariance of the perturbations for a wide range of constant values of the equation of state of the cosmic background at the early time. In this paper, we continue our study by fully analyzing its perturbations up to the third order. Apart from the usual 2-point correlation function that have already been calculated in Feng, Qiu, and Piao [Phys. Lett. B 729, 99 (2014)], we also take into account the 3-point correlation functions, including the pure scalar part, the pure tensor part, and the cross-correlations between scalar and tensor perturbation modes. We find that for the pure scalar part, the 3-point correlation functions can generate non-Gaussianities that fit the PLANCK data very well. For the pure tensor and mixed parts, the shape functions have peaks at squeezed and equilateral limits, respectively, responsible for sizable f(NL)(sqz) and f(NL)(eql), which could be tested by the future observational data.
学科主题Physics
收录类别SCI
资助信息State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y4KF131CJ1]; NSFC [11222546]; National Basic Research Program of China [2010CB832804]
原文出处http://dx.doi.org/10.1103/PhysRevD.90.123508
语种英语
WOS记录号WOS:000346830000002
公开日期2015-06-03
源URL[http://ir.itp.ac.cn/handle/311006/15549]  
专题理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式
GB/T 7714		 Feng, KX,Qiu, TT. Curvaton with nonminimal derivative coupling to gravity: Full perturbation analysis[J]. PHYSICAL REVIEW D,2014,90(12):123508.
APA Feng, KX,&Qiu, TT.(2014).Curvaton with nonminimal derivative coupling to gravity: Full perturbation analysis.PHYSICAL REVIEW D,90(12),123508.
MLA Feng, KX,et al."Curvaton with nonminimal derivative coupling to gravity: Full perturbation analysis".PHYSICAL REVIEW D 90.12(2014):123508.

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来源：理论物理研究所

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