Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 8, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2011/08/015
Keywords
gravity; cosmological perturbation theory
Funding
- NSERC
- CRC
- Killam Research Fellowship
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We consider linear perturbations about a homogeneous and isotropic cosmological background in the projectable version of Horava-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 and is either ghost-like or tachyonic depending on the value of a free parameter. This indicates a problem for the projectable version of Horava-Lifshitz gravity.
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