Thermodynamics of nonsingular bouncing universes

Abstract

Homogeneous and isotropic, nonsingular, bouncing world models are designed to evade the initial singularity at the beginning of the cosmic expansion. Here, we study the thermodynamics of the subset of these models governed by general relativity. Considering the entropy of matter, radiation and that the entropy of the apparent horizon is proportional to its area, we argue that these models do not respect the generalised second law of thermodynamics, also away from the bounce.

12 pages, 3 figures. Version published in the European Physical Journal C

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• Dark matter and baryogenesis in the Fermi-bounce curvaton mechanism
• Signature flip in deceleration parameter: A thermodynamic phase transition?
• Cosmological solutions in spatially curved universes with adiabatic particle production
• Constraints on the radiation temperature before inflation
• Model-independent reconstruction of cosmic thermodynamics and dark energy dynamics
• Thermodynamic reconstruction in observationally constrained dynamical dark energy models
• Time evolution of the mutual information between disjoint regions in the Universe