Entropic mechanisms with generalized scalar fields in the Ekpyrotic universe

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	Entropic mechanisms with generalized scalar fields in the Ekpyrotic universe
	Li, MZ
刊名	PHYSICS LETTERS B
	2015
卷号	741 期号:0 页码:320-326
通讯作者	Li, MZ (reprint author), Univ Sci & Technol China, Interdisciplinary Ctr Theoret Study, Hefei 230026, Anhui, Peoples R China.
英文摘要	For the Ekpyrotic universe, the entropic mechanisms with minimal couplings, which have been used to generate nearly scale invariant primordial perturbations, was proved to be unstable. To overcome this difficulty, some non-minimal coupling entropic models were proposed. In this paper we extend these studies to the cases where all the scalar fields have non-standard kinetic terms. We first prove that in these general cases, without non-minimal couplings the entropic models are still unstable. The condition for the stability conflicts with the requirement for achieving scale invariant perturbations. Then we study the non-minimal coupling models and show that at least for some simple cases these models are stable and able to generate the primordial perturbations consistent with current observations. (C) 2015 The Author. Published by Elsevier B. V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
学科主题	Astronomy & Astrophysics ; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Nuclear ; Physics, Particles & Fields
关键词[WOS]	CURVATURE PERTURBATION ; INFLATIONARY UNIVERSE ; K-INFLATION ; COSMOLOGY ; FLATNESS ; HORIZON
收录类别	SCI
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/21098]
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	Li, MZ. Entropic mechanisms with generalized scalar fields in the Ekpyrotic universe[J]. PHYSICS LETTERS B,2015,741(0):320-326.
APA	Li, MZ.(2015).Entropic mechanisms with generalized scalar fields in the Ekpyrotic universe.PHYSICS LETTERS B,741(0),320-326.
MLA	Li, MZ."Entropic mechanisms with generalized scalar fields in the Ekpyrotic universe".PHYSICS LETTERS B 741.0(2015):320-326.