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题名: Matter sourced anisotropic stress for dark energy
作者: Chang, BR ;  Lu, JB ;  Xu, LX
刊名: PHYSICAL REVIEW D
出版日期: 2014
卷号: 90, 期号:10, 页码:103528
关键词: BARYON ACOUSTIC-OSCILLATIONS ;  HUBBLE CONSTANT ;  GROWTH-RATE ;  GALAXIES
学科分类: Physics
DOI: 10.1103/PhysRevD.90.103528
通讯作者: Xu, LX (reprint author), Dalian Univ Technol, Sch Phys & Optoelect Technol, Inst Theoret Phys, Dalian 116024, Peoples R China.
部门归属: [Chang, Baorong
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.
资助者: 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]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000345663500005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15564
Appears in Collections:理论物理所2014年知识产出 _期刊论文

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Recommended Citation:
Chang, BR,Lu, JB,Xu, LX. Matter sourced anisotropic stress for dark energy[J]. PHYSICAL REVIEW D,2014,90(10):103528.
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