K-chameleon and the coincidence problem

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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
ISSN	0556-2821
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
URL	查看原文
收录类别	SCI
WOS记录号	WOS:000227319800013
引用统计	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.
推荐引用方式 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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