NAOC Open IR  > 星系宇宙学研究部
When scalar field is kinetically coupled to the Einstein tensor
Gao, Changjun1,2
AbstractWe 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.
KeywordModified Gravity Gravity
Indexed BySCI
WOS IDWOS:000279604500010
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, NAOC, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Kavli Inst Theoret Phys, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Gao, Changjun. When scalar field is kinetically coupled to the Einstein tensor[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2010(6).
APA Gao, Changjun.(2010).When scalar field is kinetically coupled to the Einstein tensor.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(6).
MLA Gao, Changjun."When scalar field is kinetically coupled to the Einstein tensor".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .6(2010).
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