When scalar field is kinetically coupled to the Einstein tensor
文献类型：期刊论文
| 作者 | Gao, CJ , Chinese Acad Sci, NAOC, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China; Gao, Changjun |
| 刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
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| 出版日期 | 2010 |
| 期号 | 6页码:- |
| 关键词 | Nonminimal Derivative Couplings Quintom-dark-energy Cosmological Consequences Gravity Inflation Component Evolution Constant Equation Universe |
| ISSN号 | 1475-7516 |
| 英文摘要 | We explore the cosmic evolution of a scalar field with the kinetic term coupled to the Einstein tensor. We find that, in the absence of other matter sources or in the presence of only pressureless matter, the scalar behaves as pressureless matter and the sound speed of the scalar is vanishing. These properties enable the scalar field to be a candidate of cold dark matter. By also considering the scalar potential, we find the scalar field may play the role of both dark matter and dark energy. In this case, the equation of state of the scalar can cross the phantom divide, but this can lead to the sound speed becoming superluminal as it crosses the divide, and so is physically forbidden. Finally, if the kinetic term is coupled to more than one Einstein tensor, we find the equation of state is always approximately equal to -1 whether the potential is flat or not, and so the scalar may also be a candidate for the inflaton. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| WOS记录号 | WOS:000279604500010 |
| 公开日期 | 2012-08-02 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/5101]  |
| 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 | Gao, CJ , Chinese Acad Sci, NAOC, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Gao, CJ , Chinese Acad Sci, NAOC, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China,Gao, Changjun. When scalar field is kinetically coupled to the Einstein tensor[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2010(6):-. |
| APA | Gao, CJ , Chinese Acad Sci, NAOC, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China,&Gao, Changjun.(2010).When scalar field is kinetically coupled to the Einstein tensor.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(6),-. |
| MLA | Gao, CJ , Chinese Acad Sci, NAOC, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China,et al."When scalar field is kinetically coupled to the Einstein tensor".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .6(2010):-. |
入库方式： OAI收割
来源：理论物理研究所
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