Dynamical scalar degree of freedom in Horcava-Lifshitz gravity

被引：102
作者：
Cai, Rong-Gen [1 ]
Hu, Bin [1 ]
Zhang, Hong-Bo [1 ,2 ]
机构：
[1] Chinese Acad Sci, Key Lab Frontiers Theoret Phys, Inst Theoret Phys, Beijing 100190, Peoples R China
[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
来源：
PHYSICAL REVIEW D | 2009年 / 80卷 / 04期
关键词：
D O I：
10.1103/PhysRevD.80.041501
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We investigate the linear cosmological perturbations of Horcava-Lifshitz gravity in a Friedmann-Robertson-Walker universe without any matter. Our results show that a new gauge-invariant dynamical scalar mode emerges, due to the gauge transformation under the "foliation-preserving" diffeomorphism and "projectability condition," and it can produce a scale invariant power spectrum. In the infrared regime with lambda=1, the dynamical scalar degree of freedom turns to be a nondynamical one at the linear order level.
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页数：5
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