Nonequilibrium Thermodynamics of Dark Energy on Cosmic Apparent Horizon

In recent several years, some works have been done on cosmic thermodynamics.The apparent horizon was regarded as the key characteristic supersurface where thermodynamics can be built on perfectly. However, if the irreversible process is considered, the proper position for building thermodynamics will not be the apparent horizon anymore. The new position is related to dark energy state equation and the irreversible process parameters.