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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
Source PublicationPHYSICAL REVIEW D
KeywordDigital Sky Survey Equation-of-state Probe Wmap Observations Accelerating Universe Phantom Divide Data Release Constant Model Inflation Gravity
AbstractOne 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
Volume73Issue:8Pages:-
Subject AreaPhysics
Indexed BySCI
Citation statistics
Cited Times:122[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/6011
Collection理论物理所科研产出_SCI论文
Corresponding AuthorWei, H , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
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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