期刊
CONTINUUM MECHANICS AND THERMODYNAMICS
卷 16, 期 3, 页码 279-292出版社
SPRINGER
DOI: 10.1007/s00161-003-0168-7
关键词
non-extensive entropy; self-gravitating system; gravothermal instability; negative specific heat; stellar polytrope
After introducing the fundamental properties of self-gravitating systems, we present an application of Tsallis' generalized entropy to the analysis of their thermodynamic nature. By extremizing the Tsallis entropy, we obtain an equation of state known as the stellar polytrope. For a self-gravitating stellar system confined within a perfectly reflecting wall, we discuss the thermodynamic instability caused by its negative specific heat. The role of the extremum as a quasi-equilibrium is also demonstrated from the results of N-body simulations.
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