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题名: Rip/singularity free cosmology models with bulk viscosity
作者: Meng, XH ;  Ma, ZY
刊名: EUROPEAN PHYSICAL JOURNAL C
出版日期: 2012
卷号: 72, 期号:7, 页码:2053
关键词: EQUATION-OF-STATE ;  PALATINI FORMULATION ;  DARK ENERGY ;  R-1-MODIFIED GRAVITY ;  FRIEDMANN COSMOLOGY ;  VISCOUS COSMOLOGY ;  SCALAR FIELD ;  UNIVERSE ;  CONSTANT ;  SUPERNOVAE
学科分类: Physics
通讯作者: Meng, XH (reprint author), Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China.
部门归属: [Meng, Xin-he; Ma, Zhi-yuan] Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China; [Meng, Xin-he] Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China
英文摘要: In this paper we present two concrete models of non-perfect fluid with bulk viscosity to interpret the observed cosmic accelerating expansion phenomena, avoiding the introduction of exotic dark energy. The first model we inspect has a viscosity of the form zeta = zeta 0 + (zeta(1) -zeta(2)q) H by taking into account the decelerating parameter q, and the other model is of the form zeta = zeta(0) + zeta H-1 + zeta H-2(2). We give the exact solutions of such models and further constrain them with the latest Union2 data as well as the currently observed Hubble-parameter dataset (OHD). Then we discuss the fate of universe evolution in these models, which confronts neither future singularity nor little/pseudo rip. From the resulting curves by best-fittings we find a much more flexible evolution processing due to the presence of viscosity while being consistent with the observational data in the region of data fitting. With the bulk viscosity considered, a more realistic universe scenario is characterized comparable with the Lambda CDM model but without introducing the mysterious dark energy.
资助者: Natural Science Foundation of China [11075078, 10675062]; project of knowledge Innovation Program (PKIP) of Chinese Academy of Sciences (CAS) through the KITPC [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:000307269400002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15067
Appears in Collections:理论物理所2012年知识产出_期刊论文

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Recommended Citation:
Meng, XH,Ma, ZY. Rip/singularity free cosmology models with bulk viscosity[J]. EUROPEAN PHYSICAL JOURNAL C,2012,72(7):2053.
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