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Dark energy perturbations revisited
Li, MZ; Cai YF(蔡一夫); Li H(李虹); Zhang XM(张新民); Cai, YF; Li, H; Brandenberger, R; Zhang, XM
2011
发表期刊PHYSICS LETTERS B
卷号702期号:1页码:5-11
通讯作者[Li, Mingzhe] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China ; [Cai, Yifu ; Li, Hong ; Zhang, Xinmin] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China ; [Brandenberger, Robert] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada ; [Li, Mingzhe] Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Peoples R China ; [Li, Mingzhe ; Li, Hong ; Zhang, Xinmin] Chinese Acad Sci, Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China ; [Cai, Yifu] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA
摘要In this Letter we study the evolution of cosmological perturbations in the presence of dynamical dark energy, and revisit the issue of dark energy perturbations. For a generally parameterized equation of state (EoS) such as w(D) (z) = w(0) + w(1) z/1+z (for a single fluid or a single scalar field), the dark energy perturbation diverges when its EoS crosses the cosmological constant boundary w(D) = -1. In this Letter we present a method of treating the dark energy perturbations during the crossing of the w(D) = -1 surface by imposing matching conditions which require the induced 3-metric on the hypersurface of w(D) = -1 and its extrinsic curvature to be continuous. These matching conditions have been used widely in the literature to study perturbations in various models of early universe physics, such as Inflation, the Pre-Big-Bang and Ekpyrotic scenarios, and bouncing cosmologies. In all of these cases the EoS undergoes a sudden change. Through a detailed analysis of the matching conditions, we show that delta(D) and theta(D) are continuous on the matching hypersurface. This justifies the method used (Zhao et al., 2005, 2007; Xia et al., 2006, 2008) [1-4] in the numerical calculation and data fitting for the determination of cosmological parameters. We discuss the conditions under which our analysis is applicable. (C) 2011 Elsevier B.V. All rights reserved.
文章类型Article
关键词Dark energy Cosmological perturbations
学科领域Physics
研究领域[WOS]Physics
DOI10.1016/j.physletb.2011.06.061
URL查看原文
语种英语
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000294142600002
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被引频次:8[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/236787
专题理论物理室
粒子天体物理中心
多学科研究中心
作者单位中国科学院高能物理研究所
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Li, MZ,Cai YF,Li H,et al. Dark energy perturbations revisited[J]. PHYSICS LETTERS B,2011,702(1):5-11.
APA Li, MZ.,蔡一夫.,李虹.,张新民.,Cai, YF.,...&Zhang, XM.(2011).Dark energy perturbations revisited.PHYSICS LETTERS B,702(1),5-11.
MLA Li, MZ,et al."Dark energy perturbations revisited".PHYSICS LETTERS B 702.1(2011):5-11.
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