Matter bounce in Horava-Lifshitz cosmology

Journal Article · Sat Aug 15 04:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.043516· OSTI ID:21322444

Brandenberger, Robert ^[1]

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1. Department of Physics, McGill University, Montreal, Quebec, H3A 2T8 (Canada) and Theory Division, CERN, CH-1211 Geneva (Switzerland)

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.

• OSTI ID: 21322444
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 4 Vol. 80; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
79 ASTRONOMY AND ASTROPHYSICS
AMPLITUDES
COSMOLOGY
DISTURBANCES
FLUCTUATIONS
FORECASTING
GRAVITATION
MATTER
PERTURBATION THEORY
SCALE INVARIANCE
SPECTRA
WAVE FUNCTIONS
WAVELENGTHS