Signature flip in deceleration parameter: A thermodynamic phase transition?

Abstract

Using the Hayward-Kodama temperature for the apparent horizon, it is found that matter content in the Universe is not thermodynamically stable, and the entry to the late accelerated expansion is actually a second order phase transition. The cosmological model used for the purpose is one that imitates the $\Lambda$CDM model, the favoured model for the present Universe.

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Cited by in corpus (5)

• For a flat Universe, $C_P/C_V=-q$ : another coincidence in Cosmology?
• Cosmology in $R^2$-gravity: Effects of a Higher Derivative Scalar Condensate Background
• A dynamical systems perspective on the thermodynamics of late-time cosmology
• Thermodynamics of sign-switching dark energy models
• Thermodynamic reconstruction in observationally constrained dynamical dark energy models