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题名: Interacting vectorlike dark energy, the first and second cosmological coincidence problems
作者: Wei, H ;  蔡荣根
刊名: PHYSICAL REVIEW D
出版日期: 2006
卷号: 73, 期号:8, 页码:-
关键词: DIGITAL SKY SURVEY ;  EQUATION-OF-STATE ;  PROBE WMAP OBSERVATIONS ;  ACCELERATING UNIVERSE ;  PHANTOM DIVIDE ;  DATA RELEASE ;  CONSTANT ;  MODEL ;  INFLATION ;  GRAVITY
学科分类: Physics
通讯作者: Wei, H , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China
部门归属: Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China; Osaka Univ, Dept Phys, Osaka 5600043, Japan
英文摘要: One of the puzzles of the dark energy problem is the (first) cosmological coincidence problem, namely, why does our Universe begin the accelerated expansion recently? Why are we living in an epoch in which the dark energy density and the dust matter energy density are comparable? On the other hand, cosmological observations hint that the equation-of-state parameter (EoS) of dark energy crossed the phantom divide w(de)=-1 in the near past. Many dark energy models whose EoS can cross the phantom divide have been proposed. However, to our knowledge, these models with crossing the phantom divide only provide the possibility that w(de) can cross -1. They do not answer another question, namely, why crossing the phantom divide occurs recently? Since in many existing models whose EoS can cross the phantom divide, w(de) undulates around -1 randomly, why are we living in an epoch w(de)<-1? This can be regarded as the second cosmological coincidence problem. In this work, the cosmological evolution of the vectorlike dark energy interacting with background perfect fluid is investigated. We find that the first and second cosmological coincidence problems can be alleviated at the same time in this scenario.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000237159600004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/6011
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Wei, H,Cai, RG. Interacting vectorlike dark energy, the first and second cosmological coincidence problems[J]. PHYSICAL REVIEW D,2006,73(8):-.
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