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Wei, H; Cai, RG; Wei, H , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
K-chameleon and the coincidence problem
Source PublicationPHYSICAL REVIEW D
KeywordDigital Sky Survey High-redshift Supernovae Hubble-space-telescope Cosmological Constant Dark Energy Wmap Observations Varying-alpha Data Release Gravity Matter
AbstractIn this paper we present a hybrid model of k-essence and chameleon, named as k-chameleon. In this model, due to the chameleon mechanism, the directly strong coupling between the k-chameleon field and matters (cold dark matters and baryons) is allowed. In the radiation-dominated epoch, the interaction between the k-chameleon field and background matters can be neglected; the behavior of the k-chameleon therefore is the same as that of the ordinary k-essence. After the onset of matter domination, the strong coupling between the k-chameleon and matters dramatically changes the result of the ordinary k-essence. We find that during the matter-dominated epoch, only two kinds of attractors may exist: one is the familiar K attractor and the other is a completely new, dubbed C attractor. Once the Universe is attracted into the C attractor, the fraction energy densities of the k-chameleon Omega(phi) and dust matter Omega(m) are fixed and comparable, and the Universe will undergo a power-law accelerated expansion. One can adjust the model so that the K attractor does not appear. Thus, the k-chameleon model provides a natural solution to the cosmological coincidence problem.
2005
ISSN0556-2821
Volume71Issue:4Pages:-
Subject AreaPhysics
Indexed BySCI
Citation statistics
Cited Times:75[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/13891
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.. K-chameleon and the coincidence problem[J]. PHYSICAL REVIEW D,2005,71(4):-.
APA Wei, H,Cai, RG,&Wei, H , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China..(2005).K-chameleon and the coincidence problem.PHYSICAL REVIEW D,71(4),-.
MLA Wei, H,et al."K-chameleon and the coincidence problem".PHYSICAL REVIEW D 71.4(2005):-.
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