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Meng, XH; Dou, X; Meng, XH (reprint author), Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China.
Singularities and Entropy in Bulk Viscosity Dark Energy Model
发表期刊COMMUNICATIONS IN THEORETICAL PHYSICS
语种英语
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
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.
2011
ISSN0253-6102
卷号56期号:5页码:957-966
学科领域Physics
收录类别SCI
项目资助者Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences through the KITPC [KJCX2.YW.W10] ; Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences through the KITPC [KJCX2.YW.W10] ; Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences through the KITPC [KJCX2.YW.W10] ; Natural Science Foundation of China [11075078, 10675062]; Chinese Academy of Sciences through the KITPC [KJCX2.YW.W10]
引用统计
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/14244
专题理论物理所科研产出_SCI论文
通讯作者Meng, XH (reprint author), Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China.
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GB/T 7714
Meng, XH,Dou, X,Meng, XH . Singularities and Entropy in Bulk Viscosity Dark Energy Model[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2011,56(5):957-966.
APA Meng, XH,Dou, X,&Meng, XH .(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.
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