Dynamical Scalar Degree of Freedom in Horava-Lifshitz Gravity
High Energy Physics - Theory
2009-09-02 v3 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
Abstract
We investigate the linear cosmological perturbations of Ho\v{r}ava-Lifshitz gravity in a FRW 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 , the dynamical scalar degree of freedom turns to be a non-dynamical one at the linear order level.
Keywords
Cite
@article{arxiv.0905.0255,
title = {Dynamical Scalar Degree of Freedom in Horava-Lifshitz Gravity},
author = {Rong-Gen Cai and Bin Hu and Hong-Bo Zhang},
journal= {arXiv preprint arXiv:0905.0255},
year = {2009}
}
Comments
5pages, no figures, references added, version to appear in PRD(R)