Interacting dark fluid in the universe bounded by event horizon: a non-equilibrium prescription

A non-equilibrium thermodynamic analysis has been done for the interacting dark fluid in the universe bounded by the event horizon. From observational evidences it is assumed that at present the matter in the universe is dominated by two dark sectors-dark matter and dark energy (DE). The mutual interaction among them results in spontaneous heat flow between the horizon and the fluid system and the thermal equilibrium will no longer hold. In the present work, the dark matter is chosen in the form of dust while the DE is chosen as a perfect fluid with constant equation of state in one case and holographic DE model is chosen in the other. Finally, validity of the generalized second law of thermodynamics has been examined in both cases.