Temperature and pressure in nonextensive thermostatistics

Abstract

The definitions of the temperature in the nonextensive statistical\nthermodynamics based on Tsallis entropy are analyzed. A definition of pressure\nis proposed for nonadditive systems by using a nonadditive effective volume.\nThe thermodynamics of nonadditive photon gas is discussed on this basis. We\nshow that the Stefan-Boltzmann law can be preserved within nonextensive\nthermodynamics.\n