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题名: When scalar field is kinetically coupled to the Einstein tensor
作者: Gao, Changjun
刊名: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
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
学科分类: Physics
通讯作者: Gao, CJ , Chinese Acad Sci, NAOC, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
部门归属: [Gao, CJ] Chinese Acad Sci, NAOC, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China; [Gao, CJ] Chinese Acad Sci, Kavli Inst Theoret Phys, Beijing 100190, Peoples R China
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.
资助者: National Science Foundation of China[10533010, 10575004, 10973014]; 973 Project[2010CB833004]
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000279604500010
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5101
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Gao, Changjun. When scalar field is kinetically coupled to the Einstein tensor[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2010(6):-.
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