On Horava-Lifshitz cosmology

We give a brief overview of the Horava-Lifshitz-gravity theory, its modifications and its implications in cosmology. In particular, we discuss the various issues on the gravitational scalar mode, including its decoupling, its role as inflaton and its stability. Our analysis shows that the scalar mod...

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Bibliographic Details
Published in:Chinese physics C 2011-05, Vol.35 (5), p.429-435
Main Author: Chen, Bin (斌陈)
Format: Article
Language:English
Subjects:
Cosmology
Decoupling
Gages
Gauges
Ghosts
Scalars
Symmetry
修改
宇宙学
宇宙观
对称性
引力理论
标量
稳定性
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Summary:We give a brief overview of the Horava-Lifshitz-gravity theory, its modifications and its implications in cosmology. In particular, we discuss the various issues on the gravitational scalar mode, including its decoupling, its role as inflaton and its stability. Our analysis shows that the scalar mode could decouple naturally at λ = 1 due to the extra gauge symmetry. On the other hand, the fact that the scalar mode becomes ghost when 1/3 〈 λ 〈 1 is a real challenge to the theory. We try to overcome this problem by modifying the action such that the RG flow lies outside the problematic region. We discuss the cosmological implications of the theory.
ISSN:1674-1137
0254-3052
2058-6132
DOI:10.1088/1674-1137/35/5/004