Relaxation of collisionless self-gravitating matter - The lowest energy state

Physics – Condensed Matter – Statistical Mechanics

Scientific paper

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Elliptical Galaxies, Energy Dissipation, Galactic Evolution, Gravitational Effects, Star Formation, Thermodynamic Equilibrium, Computational Astrophysics, Statistical Mechanics, Stellar Motions

Scientific paper

This paper introduces a new aspect into the theory of relaxation of collisionless self-gravitating systems. Given an arbitrary initial distribution function the authors show by explicit construction the existence of a lowest energy state that is accessible under conservation of phase space volume. This result implies as an immediate consequence a general proof of the fact that collisionless self-gravitating systems cannot collapse into a singularity. The authors suggest that the energy difference between the initial and the lowest energy state is a measure for the energy dissipated by phase mixing. They illustrate this approach by two examples with spherical symmetry.

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