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Feng, KX; Qiu, TT; Feng, KX (reprint author), Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China.
Curvaton with nonminimal derivative coupling to gravity: Full perturbation analysis
Source PublicationPHYSICAL REVIEW D
Language英语
KeywordNon-gaussianity Inflation Cosmology Scenario Scalar
AbstractIn 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.
2014
ISSN1550-7998
Volume90Issue:12Pages:123508
Subject AreaPhysics
DOI10.1103/PhysRevD.90.123508
Indexed BySCI
Funding OrganizationState Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y4KF131CJ1]; NSFC [11222546]; National Basic Research Program of China [2010CB832804] ; 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] ; 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] ; 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]
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Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/15549
Collection理论物理所科研产出_SCI论文
Corresponding AuthorFeng, KX (reprint author), Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China.
Recommended Citation
GB/T 7714
Feng, KX,Qiu, TT,Feng, KX . Curvaton with nonminimal derivative coupling to gravity: Full perturbation analysis[J]. PHYSICAL REVIEW D,2014,90(12):123508.
APA Feng, KX,Qiu, TT,&Feng, KX .(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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