Consistency relation for the Lorentz invariant single-field inflation

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	Consistency relation for the Lorentz invariant single-field inflation
	Huang, Qing-Guo; Huang, QG , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China
刊名	JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
	2010
期号	5 页码:-
关键词	K-inflation Perturbations
ISSN号	1475-7516
英文摘要	In this paper we compute the sizes of equilateral and orthogonal shape bispectrum for the general Lorentz invariant single-field inflation. The stability of field theory implies a non-negative square of sound speed which leads to a consistency relation between the sizes of orthogonal and equilateral shape bispectrum, namely f(NLorth.) <= -0.054f(NL)(equil.). In particular, for the single-field Dirac-Born-Infeld (DBI) inflation, the consistency relation becomes f(NL)(orth.) = 0.070f(NL)(equil.) <= 0. These consistency relations are also valid in the mixed scenario where the quantum fluctuations of some other light scalar fields contribute to a part of total curvature perturbation on the super-horizon scale and may generate a local form bispectrum. A distinguishing prediction of the mixed scenario is tau(loc.)(NL) > (6/5 f(NL)(loc.) )(2). Comparing these consistency relations to WMAP 7yr data, there is still a big room for the Lorentz invariant inflation, but DBI inflation has been disfavored at more than 68% CL.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:000279490800024
公开日期	2012-08-02
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/5119]
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	Huang, QG , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Huang, Qing-Guo,Huang, QG , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China. Consistency relation for the Lorentz invariant single-field inflation[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2010(5):-.
APA	Huang, Qing-Guo,&Huang, QG , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China.(2010).Consistency relation for the Lorentz invariant single-field inflation.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(5),-.
MLA	Huang, Qing-Guo,et al."Consistency relation for the Lorentz invariant single-field inflation".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .5(2010):-.