Curvature bounce in general relativity: background and primordial spectrum

Abstract

Recent data suggest that the Universe could be positively curved. Combined with an inflationary stage, this might lead to a curvature bounce instead of the Big Bang. The background evolution is presented, as a function of the parameters controlling the cosmic evolution. The primordial tensor spectrum is also calculated and possible observational footprints of the model are underlined. Several potentials are considered and general remarks are made about "naturalness" in this context.

arXiv comment8 pages, 8 figures

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• Quantum Hořava-Lifshitz cosmology in the de Broglie-Bohm interpretation
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• Quasi-matter Bounce Cosmology in Light of Planck