Matter bounce in Horava-Lifshitz cosmology

By Robert Brandenberger. 2009

339 citations recorded by the source corpus.

Horava-Lifshitz gravity, a recent proposal for a UV-complete renormalizable gravity theory, may lead to a bouncing cosmology. In this article 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 prebounce 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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/bab22ef32e950d06cb11769eca0a6bb8b267ae35

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Citations in the corpus

The black hole and cosmological solutions in IR modified Hořava gravity (2009, background): “Since then various aspects and solutions have been studied [3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29].”
On the z=4 Horava-Lifshitz Gravity (2009, background): “Clearly one can see from the black hole entropy that z = 4 terms in the gravity action lead to the entropy correction terms 1/A and 1/A2, besides a new logarithmic term, here A ∼ x2+ is the horizon area of the black hole.”
Trans-Planckian issues for inflationary cosmology (2012, background): “Hořava-Lifshitz gravity in the presence of nonvanishing spatial curvature [49]), it is possible to have a post-bounce inflationary phase and, by time reflection symmetry, a contracting deflationary phase (see Figure 3 for the corresponding space-time diagram).”
Phenomenological aspects of Hořava–Lifshitz cosmology (2009, methodology): “For example, cosmology based on Hořava-Lifshitz gravity was investigated in [2, 3, 4, 5, 6, 7, 8, 9, 10].”
Field theory at a Lifshitz point (2009, background): “Since Horava gravity has a very nice UV behavior, it has been applied to investigate the physics in the early universe in [5, 6, 7, 8, 9, 10, 11].”
Non-singular cosmology in a model of non-relativistic gravity (2009, background): “In the frame of a Friedmann-Robertson-Walker (FRW) universe, dark radiation with negative energy density can give rise to a bouncing solution [10], since it breaks energy conditions if accompanied by normal matter components [11].”