Phantom dark energy as an effect of bulk viscosity

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	Velten, H; Wang, JX; Meng, XH; Velten, H (reprint author), Univ Fed Espirito Santo, Dept Fs, BR-29060900 Vitoria, Espirito Santo, Brazil.
	Phantom dark energy as an effect of bulk viscosity
发表期刊	PHYSICAL REVIEW D
语种	英语
关键词	Baryon Acoustic-oscillations Probe Wmap Observations Cosmological Constant Problem Digital Sky Survey Driven Inflationary Viscous Cosmology Models Universe Thermodynamics Parameters
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.
	2013
ISSN	1550-7998
卷号	88 期号:12 页码:123504
学科领域	Physics
收录类别	SCI
项目资助者	CNPq; Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences (CAS) [KJCX2.YW.W10] ; CNPq; Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences (CAS) [KJCX2.YW.W10] ; CNPq; Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences (CAS) [KJCX2.YW.W10] ; CNPq; Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences (CAS) [KJCX2.YW.W10]
引用统计	被引频次：23[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.itp.ac.cn/handle/311006/15212
专题	理论物理所科研产出_SCI论文
通讯作者	Velten, H (reprint author), Univ Fed Espirito Santo, Dept Fs, BR-29060900 Vitoria, Espirito Santo, Brazil.
推荐引用方式 GB/T 7714	Velten, H,Wang, JX,Meng, XH,et al. Phantom dark energy as an effect of bulk viscosity[J]. PHYSICAL REVIEW D,2013,88(12):123504.
APA	Velten, H,Wang, JX,Meng, XH,&Velten, H .(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.

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