K-chameleon and the coincidence problem
文献类型：期刊论文
| 作者 | Wei, H , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.; Cai, RG ; Wei, H
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| 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 |
| ISSN号 | 0556-2821 |
| 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. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| WOS记录号 | WOS:000227319800013 |
| 公开日期 | 2012-08-30 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/13891]  |
| 专题 | 理论物理研究所_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 , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.,Cai, RG,Wei, H. K-chameleon and the coincidence problem[J]. PHYSICAL REVIEW D,2005,71(4):-. |
| APA | Wei, H , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.,Cai, RG,&Wei, H.(2005).K-chameleon and the coincidence problem.PHYSICAL REVIEW D,71(4),-. |
| MLA | Wei, H , Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100080, Peoples R China.,et al."K-chameleon and the coincidence problem".PHYSICAL REVIEW D 71.4(2005):-. |
入库方式： OAI收割
来源：理论物理研究所
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