The concept of temperature in a nonextensive scenario

Tsallis' non-extensive thermostatistics: (Tsallis et al., Physica A 261 (19 98) 534; Tsallis, in: Abe, Okamoto (Eds.), Nonextensive Statistical Mechani cs and its Applications, Lecture Notes in Physics, Springer, Berlin, 2000; Tsallis, Brat. J. Phys. 29 (1991) 1; Plastino and Plastino, in: Ludena (Ed. ), Condensed Matter Theories, Nova Science Publishers, New York, USA, 1996, p. 341; Plastino and Plastino, Brat. J. Phys. 29 (1999) 79) is by now reco gnized as a new paradigm for statistical mechanical considerations. In a no nextensive scenario, however, the concept of temperature should be handled with some care, as some difficulties ensue (Tsallis, 2000). Ln this work we discuss this problem and reach some useful conclusions. (C) 2001 Elsevier Science B.V. All rights reserved.