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arxiv: 1009.4074 · v1 · submitted 2010-09-21 · ✦ hep-th

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The good, the bad and the ugly .... of Horava gravity

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classification ✦ hep-th
keywords gravitytheoryexplaingoodhoravareviewuglyblas
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I review the good, the bad and the ugly of the non-projectable versions of Horava gravity. I explain how this non-relativistic theory was constructed and why it was touted with such excitement as a quantum theory of gravity. I then review some of the issues facing the theory, explaining how strong coupling occurs and why this is such a problem for both phenomenology and the question of renormalisability. Finally I comment on possible violations of Equivalence Principle, and explain why these could be an issue for Blas et al's "healthy extension". This paper was presented as a talk at PASCOS 2010 in Valencia.

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