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Wei, H; Cai, RG; Wei, H , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China
Interacting vectorlike dark energy, the first and second cosmological coincidence problems
发表期刊PHYSICAL REVIEW D
关键词Digital Sky Survey Equation-of-state Probe Wmap Observations Accelerating Universe Phantom Divide Data Release Constant Model Inflation Gravity
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.
2006
ISSN1550-7998
卷号73期号:8页码:-
学科领域Physics
收录类别SCI
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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/6011
专题理论物理所科研产出_SCI论文
通讯作者Wei, H , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China
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Wei, H,Cai, RG,Wei, H , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China. Interacting vectorlike dark energy, the first and second cosmological coincidence problems[J]. PHYSICAL REVIEW D,2006,73(8):-.
APA Wei, H,Cai, RG,&Wei, H , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.(2006).Interacting vectorlike dark energy, the first and second cosmological coincidence problems.PHYSICAL REVIEW D,73(8),-.
MLA Wei, H,et al."Interacting vectorlike dark energy, the first and second cosmological coincidence problems".PHYSICAL REVIEW D 73.8(2006):-.
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