Negative heat capacity and nonextensive kinetic theory

Details Negative heat capacity and nonextensive kinetic theory Negative heat capacity and nonextensive kinetic theory

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23..234s&link_type=abstract

Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 234-235

Astronomy and Astrophysics

Astronomy

Scientific paper

The negative nature of the heat capacity CV of thermodynamically isolated self-gravitating systems is rediscussed in the framework of a non-extensive kinetic theory. In particular, we derive a new analytical expression for this quantity which gives rise to an entire negative branch. We show that for this kind of system the value q = 5/3 is an upper limit for the non-extensive parameter. In connection with stellar polytropes, the value of this parameter, q = 5/3, corresponds to a polytropic index n = 3 or n = -1, depending on the adopted relation for n and q.

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