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Thermodynamics on the cosmological apparent horizon of a flatFriedmann-Lemaitre-Robertson-Walker metric has been investigated withBekenstein entropy and Hawking temperature on the horizon, and Unruhtemperature for the fluid inside the horizon. This temperature is experiencedby a radial comoving observer infinitesimally close to the horizon due to thepressure exerted by the fluid bounded by the horizon. An expression for theentropy of the fluid has been obtained which is found to be proportional to thevolume of the thermodynamic system which implies that the Unruh temperature ofthe fluid is inconsistent with the holographic principle. Further, we have beenable to find an expression for the effective entropy of the system. Finally,assuming a barotropic equation of state $p=w\rho$ ($w$ constant) for the fluid,it has been shown that the generalized second law holds good for a non-phantomw, while thermodynamic equilibrium is never possible for such a scenario.

Cosmological thermodynamics with Hawking temperature on the apparent horizon and Unruh temperature of the fluid: Some interesting consequences