Cosmological Perturbations in the Projectable Version of Horava-Lifshitz Gravity

Details Cosmological Perturbations in the Projectable Version of Horava-Lifshitz Gravity Cosmological Perturbations in the Projectable Version of Horava-Lifshitz Gravity

2010-07-06

arxiv.org/abs/1007.1006v1

JCAP 1108:015,2011

Physics

High Energy Physics

High Energy Physics - Theory

13 pages

Scientific paper

10.1088/1475-7516/2011/08/015

We consider linear perturbations about a homogeneous and isotropic cosmological background in the projectable version of Ho\v{r}ava-Lifshitz gravity. Starting from the action for cosmological perturbations, we identify the canonically normalized fluctuation variables. We find that - in contrast to what happens in the non-projectable version of the theory - the extra scalar cosmological perturbation mode is already dynamical at the level of linear perturbations. For values of the parameter $\lambda$ in the range $1/3 < \lambda < 1$, the extra mode is ghost-like, for values $1 < \lambda$ and $\lambda < 1/3$ it is tachyonic. This indicates a problem for the projectable version of Ho\v{r}ava-Lifshitz gravity.

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