Cosmological Perturbations in the "Healthy Extension'' of Horava-Lifshitz gravity

Details Cosmological Perturbations in the "Healthy Extension'' of Horava-Lifshitz gravity Cosmological Perturbations in the "Healthy Extension'' of Horava-Lifshitz gravity

2010-08-21

arxiv.org/abs/1008.3589v1

Physics

High Energy Physics

High Energy Physics - Theory

11 pages

Scientific paper

We study linear cosmological perturbations in the ``healthy extension'' of Horava-Lifshitz gravity which has recently been analyzed \cite{BPS2}. We find that there are two degrees of freedom for scalar metric fluctuations, but that one of them decouples in the infrared limit. Also, for appropriate choices of the parameters defining the Lagrangian, the extra mode can be made well-behaved even in the ultraviolet.

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