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题名: Phantom dark energy as an effect of bulk viscosity
作者: Velten, H ;  Wang, JX ;  Meng, XH
刊名: PHYSICAL REVIEW D
出版日期: 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
学科分类: Physics
通讯作者: Velten, H (reprint author), Univ Fed Espirito Santo, Dept Fs, BR-29060900 Vitoria, Espirito Santo, Brazil.
部门归属: [Velten, Hermano] Univ Fed Espirito Santo, Dept Fs, BR-29060900 Vitoria, Espirito Santo, Brazil; [Wang, Jiaxin; Meng, Xinhe] Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China; [Meng, Xinhe] Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China
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.
资助者: CNPq; Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences (CAS) [KJCX2.YW.W10]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000328602900004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15212
Appears in Collections:理论物理所2013年知识产出 _期刊论文

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Recommended Citation:
Velten, H,Wang, JX,Meng, XH. Phantom dark energy as an effect of bulk viscosity[J]. PHYSICAL REVIEW D,2013,88(12):123504.
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