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题名: Consistency relation for the Lorentz invariant single-field inflation
作者: Huang, Qing-Guo
刊名: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
出版日期: 2010
期号: 5, 页码:-
关键词: K-INFLATION ;  PERTURBATIONS
学科分类: Physics
通讯作者: Huang, QG , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China
部门归属: [Huang, QG] Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China; [Huang, QG] Korea Inst Adv Study, Sch Phys, Seoul 130722, South Korea
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.
资助者: Chinese Academy of Science
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000279490800024
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5119
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Huang, Qing-Guo. Consistency relation for the Lorentz invariant single-field inflation[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2010(5):-.
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