Self-gravitating stellar systems and non-extensive thermostatistics

被引：40

作者：

Sakagami, M ^{[1
]}

Taruya, A

机构：

[1] Kyoto Univ, Grad Sch Human & Environm Studies, Kyoto 6068501, Japan

[2] Univ Tokyo, Res Ctr Early Universe, Sch Sci, Tokyo 1130033, Japan

来源：

CONTINUUM MECHANICS AND THERMODYNAMICS | 2004年 / 16卷 / 03期

关键词：

non-extensive entropy; self-gravitating system; gravothermal instability; negative specific heat; stellar polytrope;

D O I：

10.1007/s00161-003-0168-7

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

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.

引用

页码：279 / 292

页数：14

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