The generalized second law for the interacting generalized Chaplygin gas model

TL;DR

This paper examines the validity of the generalized second law of thermodynamics in a non-flat universe with interacting generalized Chaplygin gas, showing it always holds under thermal equilibrium regardless of spatial curvature.

Contribution

It demonstrates that the GSL is always satisfied in a non-flat universe with interacting generalized Chaplygin gas, regardless of the equation of state or spatial curvature.

Findings

GSL holds throughout the universe's history in the model

Equation of state can cross the phantom divide

GSL validity is independent of spatial curvature

Abstract

We investigate the validity of the generalized second law (GSL) of gravitational thermodynamics in a non-flat FRW universe containing the interacting generalized Chaplygin gas with the baryonic matter. The dynamical apparent horizon is assumed to be the boundary of the universe. We show that for the interacting generalized Chaplygin gas as a unified candidate for dark matter (DM) and dark energy (DE), the equation of state parameter can cross the phantom divide. We also present that for the selected model under thermal equilibrium with the Hawking radiation, the GSL is always satisfied throughout the history of the universe for any spatial curvature, independently of the equation of state of the interacting generalized Chaplygin gas model.