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Entropic mechanisms with generalized scalar fields in the Ekpyrotic universe
Li, MZ; Li, MZ (reprint author), Univ Sci & Technol China, Interdisciplinary Ctr Theoret Study, Hefei 230026, Anhui, Peoples R China.
2015
发表期刊PHYSICS LETTERS B
卷号741期号:0页码:320-326
文章类型Article
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/).
学科领域Astronomy & Astrophysics ; Physics
资助者NSFC [11422543] ; NSFC [11422543] ; NSFC [11422543] ; NSFC [11422543] ; Program for New Century Excellent Talents in University ; Program for New Century Excellent Talents in University ; Program for New Century Excellent Talents in University ; Program for New Century Excellent Talents in University ; NSFC [11422543] ; NSFC [11422543] ; NSFC [11422543] ; NSFC [11422543] ; Program for New Century Excellent Talents in University ; Program for New Century Excellent Talents in University ; Program for New Century Excellent Talents in University ; Program for New Century Excellent Talents in University
DOIhttp://dx.doi.org/10.1016/j.physletb.2015.01.009
关键词[WOS]CURVATURE PERTURBATION ; INFLATIONARY UNIVERSE ; K-INFLATION ; COSMOLOGY ; FLATNESS ; HORIZON
收录类别SCI
语种英语
资助者NSFC [11422543] ; NSFC [11422543] ; NSFC [11422543] ; NSFC [11422543] ; Program for New Century Excellent Talents in University ; Program for New Century Excellent Talents in University ; Program for New Century Excellent Talents in University ; Program for New Century Excellent Talents in University ; NSFC [11422543] ; NSFC [11422543] ; NSFC [11422543] ; NSFC [11422543] ; Program for New Century Excellent Talents in University ; Program for New Century Excellent Talents in University ; Program for New Century Excellent Talents in University ; Program for New Century Excellent Talents in University
WOS类目Astronomy & Astrophysics ; Physics, Nuclear ; Physics, Particles & Fields
引用统计
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/21098
专题理论物理所SCI论文
通讯作者Li, MZ (reprint author), Univ Sci & Technol China, Interdisciplinary Ctr Theoret Study, Hefei 230026, Anhui, Peoples R China.
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Li, MZ,Li, MZ . Entropic mechanisms with generalized scalar fields in the Ekpyrotic universe[J]. PHYSICS LETTERS B,2015,741(0):320-326.
APA Li, MZ,&Li, MZ .(2015).Entropic mechanisms with generalized scalar fields in the Ekpyrotic universe.PHYSICS LETTERS B,741(0),320-326.
MLA Li, MZ,et al."Entropic mechanisms with generalized scalar fields in the Ekpyrotic universe".PHYSICS LETTERS B 741.0(2015):320-326.
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