Cosmological Perturbations and Non-Gaussianities in Hořava-Lifshitz Gravity

Details Cosmological Perturbations and Non-Gaussianities in Hořava-Lifshitz Gravity Cosmological Perturbations and Non-Gaussianities in Hořava-Lifshitz Gravity

2009-04-27

arxiv.org/abs/0904.4187v4

Physics

High Energy Physics

High Energy Physics - Theory

12 pages, no figure, v4, typos corrected, gauge problem is added

Scientific paper

We investigate cosmological perturbations and non-gaussianities in Ho\v{r}ava-Lifshitz theory of gravitation. In the UV limit, the scalar perturbation in Ho\v{r}ava theory is naturally scale-invariant, ignoring the details of the expansion of the universe. Thus one may relax the exponential inflation and the slow-roll conditions for the inflaton field. Moreover, in the absence of slow-roll conditions, it is possible that the "slow-roll suppressed" non-gaussianities resume to become large. We calculate the non-gaussianities from the bispectrum of the perturbation and find that, the equilateral-type non-gaussianity is of order unity, while the local-type non-gaussianity remains small as in usual single-field slow-roll inflation model in general relativity.

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