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题名: K-chameleon and the coincidence problem
作者: Wei, H ;  蔡荣根
刊名: PHYSICAL REVIEW D
出版日期: 2005
卷号: 71, 期号:4, 页码:-
关键词: DIGITAL SKY SURVEY ;  HIGH-REDSHIFT SUPERNOVAE ;  HUBBLE-SPACE-TELESCOPE ;  COSMOLOGICAL CONSTANT ;  DARK ENERGY ;  WMAP OBSERVATIONS ;  VARYING-ALPHA ;  DATA RELEASE ;  GRAVITY ;  MATTER
学科分类: Physics
通讯作者: Wei, H , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.
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
英文摘要: 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.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000227319800013
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13891
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Wei, H,Cai, RG. K-chameleon and the coincidence problem[J]. PHYSICAL REVIEW D,2005,71(4):-.
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