The space-time of the Universe has been perturbed under a scalar field $\phi$
considering the minimum coupling between {\phi} 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 $\phi$.
