Matter sourced anisotropic stress for dark energy

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	Matter sourced anisotropic stress for dark energy
	Chang, BR ; Lu, JB ; Xu, LX
刊名	PHYSICAL REVIEW D
	2014
卷号	90 期号:10 页码:103528
关键词	BARYON ACOUSTIC-OSCILLATIONS HUBBLE CONSTANT GROWTH-RATE GALAXIES
ISSN号	1550-7998
通讯作者	Xu, LX (reprint author), Dalian Univ Technol, Sch Phys & Optoelect Technol, Inst Theoret Phys, Dalian 116024, Peoples R China.
英文摘要	Usually a dark energy as a perfect fluid is characterized by the ratio of pressure to energy density (w = p/rho) and the ratio of their perturbations in its rest frame (c(s)(2) = delta p/delta rho). However, a dark energy would have other characteristics beyond its equation of state and the effective speed of sound. Here the extra property is the anisotropic stress sourced by matter as a simple extension to the perfect fluid model. At the background level, this anisotropic stress is zero with respect to the cosmological principle, but not at the first-order perturbation. We tested the viability of the existence of this kind of anisotropic stress by using the currently available cosmic observations through the geometrical and dynamical measurements. Using the Markov-chain Monte Carlo method, we found that the upper bounds on the anisotropic stress which enters into the summation of the Newtonian potentials should be of the order O(10(-3))Delta(m). We did not find any strong evidence for the existence of this matter-sourced anisotropic stress, even in the 1 sigma region.
学科主题	Physics
收录类别	SCI
资助信息	NSFC [11275035]; Fundamental Research Funds for the Central Universities [DUT13LK01]; Open Project Program of the State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, China [Y4KF101CJ1]
原文出处	http://dx.doi.org/10.1103/PhysRevD.90.103528
语种	英语
WOS记录号	WOS:000345663500005
公开日期	2015-06-03
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/15564]
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	Chang, BR,Lu, JB,Xu, LX. Matter sourced anisotropic stress for dark energy[J]. PHYSICAL REVIEW D,2014,90(10):103528.
APA	Chang, BR,Lu, JB,&Xu, LX.(2014).Matter sourced anisotropic stress for dark energy.PHYSICAL REVIEW D,90(10),103528.
MLA	Chang, BR,et al."Matter sourced anisotropic stress for dark energy".PHYSICAL REVIEW D 90.10(2014):103528.