Jeans' gravitational instability and nonextensive kinetic theory

Details Jeans' gravitational instability and nonextensive kinetic theory Jeans' gravitational instability and nonextensive kinetic theory

2001-09-26

arxiv.org/abs/astro-ph/0109474v2

Astron.Astrophys. 396 (2002) 309-314

Astronomy and Astrophysics

Astrophysics

5 pages, including 3 figures. Accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20021395

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 cutoff, the instability condition is weakened with the system becoming unstable even for wavelengths of the disturbance smaller than the standard Jeans length $\lambda_J$.

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