Europhys. Lett.
Volume 65, Number 5, March 2004
Page(s) 606 - 612
Section General
Published online 01 February 2004
Europhys. Lett., 65 (5) , pp. 606-612 (2004)
DOI: 10.1209/epl/i2003-10171-6

Temperature and pressure in nonextensive thermostatistics

Q. A. Wang1, L. Nivanen1, A. Le Méhauté1 and M. Pezeril2

1  Institut Supérieur des Matériaux et Mécaniques Avancés 44 Avenue F. A. Bartholdi, 72000 Le Mans, France
2  Laboratoire de Physique de l'état Condensé, Université du Maine 72000 Le Mans, France

(Received 5 November 2003; accepted 17 December 2003)

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

05.20.-y - Classical statistical mechanics.
05.70.-a - Thermodynamics.
02.50.-r - Probability theory, stochastic processes, and statistics.

© EDP Sciences 2004