Do recent observations favor a cosmological event horizon: A thermodynamical prescription?
Recent observational evidence supports an accelerating expansion of the Universe during the present epoch. It is commonly incorporated into standard cosmology by the introduction of exotic matter (which violates the strong energy condition) known as dark energy (DE). As an event horizon exists for an accelerating universe, there has been much work on universal thermodynamics, i.e., thermodynamics of a universe bounded by an apparent or event horizon. Recently, thermodynamical equilibrium has been examined for both types of horizons. In the present work we show that universal thermodynamics with an event horizon is favored by DE from the point of view of an equilibrium thermodynamical prescription.