期刊
ASTRONOMY & ASTROPHYSICS
卷 396, 期 1, 页码 309-313出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20021395
关键词
gravitation; hydrodynamics
资金
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [00/06695-0] Funding Source: FAPESP
The concept of Jeans gravitational instability is rediscussed in the framework of nonextensive statistics and its associated kinetic theory. A simple analytical formula generalizing the Jeans criterion is derived by assuming that the unperturbed self-gravitating collisionless gas is kinetically described by the q-parameterized class of power law velocity distributions. It is found that the critical values of wavelength and mass depend explicitly on the nonextensive q-parameter. The standard Jeans wavelength derived for a Maxwellian distribution is recovered in the limiting case q = 1. For power-law distributions with cut-off, the instability condition is weakened with the system becoming unstable even for wavelengths of the disturbance smaller than the standard Jeans length lambda(J).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据