Phantom dark energy as an effect of bulk viscosity

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	Phantom dark energy as an effect of bulk viscosity
	Velten, H ; Wang, JX ; Meng, XH
刊名	PHYSICAL REVIEW D
	2013
卷号	88 期号:12 页码:123504
关键词	BARYON ACOUSTIC-OSCILLATIONS PROBE WMAP OBSERVATIONS COSMOLOGICAL CONSTANT PROBLEM DIGITAL SKY SURVEY DRIVEN INFLATIONARY VISCOUS COSMOLOGY MODELS UNIVERSE THERMODYNAMICS PARAMETERS
ISSN号	1550-7998
通讯作者	Velten, H (reprint author), Univ Fed Espirito Santo, Dept Fs, BR-29060900 Vitoria, Espirito Santo, Brazil.
英文摘要	In a homogeneous and isotropic universe bulk viscosity is the unique viscous effect that is capable of modifying the background dynamics. Effects like shear viscosity or heat conduction can only change the evolution of the perturbations. The existence of a bulk viscous pressure in a fluid-which in order to obey the second law of thermodynamics must be negative-reduces its effective pressure. We discuss the degeneracy in bulk viscous cosmologies and address the possibility that phantom dark energy cosmology could be caused by the existence of nonequilibrium pressure in any one of the cosmic components. We establish the conditions under which either viscous matter or radiation cosmologies can be mapped into the phantom dark energy scenario with constraints from multiple observational data sets.
学科主题	Physics
收录类别	SCI
资助信息	CNPq; Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences (CAS) [KJCX2.YW.W10]
原文出处	http://dx.doi.org/10.1103/PhysRevD.88.123504
语种	英语
WOS记录号	WOS:000328602900004
公开日期	2014-04-25
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/15212]
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	Velten, H,Wang, JX,Meng, XH. Phantom dark energy as an effect of bulk viscosity[J]. PHYSICAL REVIEW D,2013,88(12):123504.
APA	Velten, H,Wang, JX,&Meng, XH.(2013).Phantom dark energy as an effect of bulk viscosity.PHYSICAL REVIEW D,88(12),123504.
MLA	Velten, H,et al."Phantom dark energy as an effect of bulk viscosity".PHYSICAL REVIEW D 88.12(2013):123504.