Non-equilibrium thermodynamics in the non-canonical scalar field perturbed space-time : Stability analysis

Abstract

The space-time of the Universe has been perturbed under a scalar field $\varphi$ considering the minimum coupling between ϕ and the background metric. The solutions of Einstein field equations have been obtained under perturbed geometry and the corresponding conservation equation shows the non-equilibrium thermodynamic prescription of the cosmic fluid. Following the stability criteria of the cosmic fluid along with the laws of thermodynamics, some constraints have been imposed on the choice of $\varphi$.