Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-05-03
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
20 pages 1 figure
Scientific paper
A kinetic equation for the collisional evolution of stable, bound, self gravitating and slowly relaxing systems is established, which is valid when the number of constituents is very large. It accounts for the detailed dynamics and self consistent dressing by collective gravitational interaction of the colliding particles, for the system's inhomogeneity and for different constituent's masses. The evolution of the one-body distribution function is described in action angle space. The collision operators are expressed in terms of the collective response function allowed by the existing distribution functions at any given time and involve particles in resonant motions. The set of equations which describe the coupled evolution of the distribution functions and of the potential is derived for spherical systems. In the homogeneous limit, which sacrifices the description of the evolution of the spatial structure of the system, but retains the effects of collective gravitational dressing, the kinetic equation reduces to a form similar to the Balescu-Lenard equation of plasma physics.
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