Matter Bounce in Horava-Lifshitz Cosmology

Details Matter Bounce in Horava-Lifshitz Cosmology Matter Bounce in Horava-Lifshitz Cosmology

2009-04-18

arxiv.org/abs/0904.2835v2

Physics

High Energy Physics

High Energy Physics - Theory

6 pages, 1 figure, a couple of minor wording changes

Scientific paper

Horava-Lifshitz gravity, a recent proposal for a UV-complete renormalizable gravity theory, may lead to a bouncing cosmology. In this note we argue that Horava-Lifshitz cosmology may yield a concrete realization of the matter bounce scenario, and thus give rise to an alternative to inflation for producing a scale-invariant spectrum of cosmological perturbations. In this scenario, quantum vacuum fluctuations exit the Hubble radius in the pre-bounce phase and the spectrum is transformed into a scale-invariant one on super-Hubble scales before the bounce because the long wavelength modes undergo squeezing of their wave-functions for a longer period of time than shorter wavelength modes. The scale-invariance of the spectrum of curvature fluctuations is preserved during and after the bounce. A distinctive prediction of this scenario is the amplitude and shape of the bispectrum.

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