Entropic Cosmology from a Thermodynamics Viewpoint

Abstract

Entropic cosmology is a recently proposed cosmological model that aims to explain the accelerated expansion of the Universe. In this study, we examine a nonadiabatic expansion of the universe in entropic cosmology, from a thermodynamics viewpoint. We derive the continuity (conservation) equation from the first law of thermodynamics, assuming the nonadiabatic expansion caused by the entropy and temperature on the horizon of the universe. Using the continuity equation, we reformulate entropic cosmology. The simple model proposed here agrees well with supernova data which take into account the Planck 2013 results.