Curvaton with nonminimal derivative coupling to gravity: Full perturbation analysis

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	Curvaton with nonminimal derivative coupling to gravity: Full perturbation analysis
	Feng, KX ; Qiu, TT
刊名	PHYSICAL REVIEW D
	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
内容类型	期刊论文
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.