Constraints on the sound speed of dynamical dark energy

被引：95

作者：

Xia, Jun-Qing ^{[1
]}

Cai, Yi-Fu ^{[1
]}

Qiu, Tao-Tao ^{[1
]}

Zhao, Gong-Bo ^{[1
]}

Zhang, Xinmin ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, POB 918-4, Beijing 100049, Peoples R China

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS D | 2008年 / 17卷 / 08期

基金：

中国国家自然科学基金;

关键词：

dark energy; sound speed; perturbation; no-go theorem;

D O I：

10.1142/S0218271808012784

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this paper we study in detail the sound speed - c(s)(2), which is directly related to the classical perturbations - of dynamical dark energy (DE). We consider especially the case with an equation of state crossing the cosmological constant boundary, and show its implications for cosmic microwave background (CMB) anisotropy. With the present observational data on the CMB, the Type Ia supernova (SNIa) and galaxy clustering, we perform a global analysis to constrain the sound speed of DE, using the Markov chain Monte Carlo method. We find that the sound speed of DE is weakly constrained by current observations, and thus futuristic precision measurements of the CMB on a very large angular scale (low multipoles) are necessary.

引用

页码：1229 / 1243

页数：15

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