Nature of entropy in a scalar-tensor theory of gravity

Authors: ONUR SIĞINÇ, MUSTAFA SALTI, HİLMİ YANAR, OKTAY AYDOĞDU

Abstract: This work is devoted to studying the generalized nature of the entropy function in a specific form of the scalar-tensor-vector (STeVe) theory of gravity for the Friedmann-Lemaitre-Robertson-Walker (FLRW) spacetime in the state of thermal equilibrium. For this purpose, we define an equilibrium picture of thermodynamics by making use of a suitable set of the dark energy density and dark pressure descriptions, which defines an energy-momentum tensor obeying the local energy conservation law. Furthermore, we also discuss our results numerically in order to get additional implications.

Keywords: Thermodynamics, entropy, modified gravity, cosmology

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