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K-chameleon and the coincidence problem
Wei, H; Cai, RG; Wei, H , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
2005
发表期刊PHYSICAL REVIEW D
ISSN0556-2821
卷号71期号:4页码:-
摘要In 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.
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; Baylor Univ, Dept Phys, CASPER, Waco, TX 76798 USA
关键词Digital Sky Survey High-redshift Supernovae Hubble-space-telescope Cosmological Constant Dark Energy Wmap Observations Varying-alpha Data Release Gravity Matter
学科领域Physics
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收录类别SCI
WOS记录号WOS:000227319800013
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被引频次:75[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/13891
专题理论物理所1978-2010年知识产出
通讯作者Wei, H , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
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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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