Quasi-equilibria in one-dimensional self-gravitating many body systems

Details Quasi-equilibria in one-dimensional self-gravitating many body systems Quasi-equilibria in one-dimensional self-gravitating many body systems

1994-02-15

arxiv.org/abs/chao-dyn/9402003v1

Astronomy and Astrophysics

Astrophysics

21pages + 7 figures (available upon request), revtex, submitted to Physical Review E

Scientific paper

10.1103/PhysRevE.50.2607

The microscopic dynamics of one-dimensional self-gravitating many-body systems is studied. We examine two courses of the evolution which has the isothermal and stationary water-bag distribution as initial conditions. We investigate the evolution of the systems toward thermal equilibrium. It is found that when the number of degrees of freedom of the system is increased, the water-bag distribution becomes a quasi-equilibrium, and also the stochasticity of the system reduces. This results suggest that the phase space of the system is effectively not ergodic and the system with large degreees of freedom approaches to the near-integrable one.

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