Dynamical scalar degree of freedom in Horcava-Lifshitz gravity

被引：104

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.

引用

页数：5

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