Singularities and Entropy in Bulk Viscosity Dark Energy Model

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	Singularities and Entropy in Bulk Viscosity Dark Energy Model
	Meng, XH ; Dou, X
刊名	COMMUNICATIONS IN THEORETICAL PHYSICS
	2011
卷号	56 期号:5 页码:957-966
关键词	EQUATION-OF-STATE ANISOTROPY-PROBE OBSERVATIONS PALATINI FORMULATION MODIFIED GRAVITY R-1-MODIFIED GRAVITY FRIEDMANN COSMOLOGY EXPANDING UNIVERSE VISCOUS COSMOLOGY FLUID CONSTRAINTS
ISSN号	0253-6102
通讯作者	Meng, XH (reprint author), Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China.
英文摘要	In this paper bulk viscosity is introduced to describe the effects of cosmic non-perfect fluid on the cosmos evolution and to build the unified dark energy (DE) with (dark) matter models. Also we derive a general relation between the bulk viscosity form and Hubble parameter that can provide a procedure for the viscosity DE model building. Especially, a redshift dependent viscosity parameter zeta proportional to lambda(0) + lambda(1) (1 + z)(n) proposed in the previous work [X.H. Meng and X. Dou, Commun. Theor. Phys. 52 (2009) 377] is investigated extensively in this present work. Further more we use the recently released supernova dataset (the Constitution dataset) to constrain the model parameters. In order to differentiate the proposed concrete dark energy models from the well known Lambda CDM model, statefinder diagnostic method is applied to this bulk viscosity model, as a complementary to the Om parameter diagnostic and the deceleration parameter analysis performed by us before. The DE model evolution behavior and tendency are shown in the plane of the statefinder diagnostic parameter pair {r, s} as axes where the fixed point represents the Lambda CDM model. The possible singularity property in this bulk viscosity cosmology is also discussed to which we can conclude that in the different parameter regions chosen properly, this concrete viscosity DE model can have various late evolution behaviors and the late time singularity could be avoided. We also calculate the cosmic entropy in the bulk viscosity dark energy frame, and find that the total entropy in the viscosity DE model increases monotonously with respect to the scale factor evolution, thus this monotonous increasing property can indicate an arrow of time in the universe evolution, though the quantum version of the arrow of time is still very puzzling.
学科主题	Physics
收录类别	SCI
资助信息	Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences through the KITPC [KJCX2.YW.W10]
原文出处	http://dx.doi.org/10.1088/0253-6102/56/5/27
语种	英语
WOS记录号	WOS:000297269000027
公开日期	2013-05-17
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/14244]
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	Meng, XH,Dou, X. Singularities and Entropy in Bulk Viscosity Dark Energy Model[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2011,56(5):957-966.
APA	Meng, XH,&Dou, X.(2011).Singularities and Entropy in Bulk Viscosity Dark Energy Model.COMMUNICATIONS IN THEORETICAL PHYSICS,56(5),957-966.
MLA	Meng, XH,et al."Singularities and Entropy in Bulk Viscosity Dark Energy Model".COMMUNICATIONS IN THEORETICAL PHYSICS 56.5(2011):957-966.