Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2010-03-04
Proceedings of the 12th Marcel Grossmann Meeting (World Scientific, Singapore, 2010)
Physics
Condensed Matter
Statistical Mechanics
A short review summarizing our results on self-gravitating gas since 2002
Scientific paper
We review the out-of-equilibrium properties of a self-gravitating gas of particles in the presence of a strong friction and a random force (canonical gas). We assume a bare diffusion coefficient of the form $D(\rho)=T\rho^{1/n}$, where $\rho$ is the local particle density, so that the equation of state is $P(\rho)=D(\rho)\rho$. Depending on the spatial dimension $d$, the index $n$, the temperature $T$, and whether the system is confined to a finite box or not, the system can reach an equilibrium state, collapse or evaporate. This article focuses on the latter cases, presenting a complete dynamical phase diagram of the system.
Chavanis Pierre-Henri
Sire Clément
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