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Communication Dans Un Congrès Année : 2010

Collapse and evaporation of a canonical self-gravitating gas

Résumé

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.

Dates et versions

hal-00461637 , version 1 (05-03-2010)

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Clément Sire, Pierre-Henri Chavanis. Collapse and evaporation of a canonical self-gravitating gas. 12th Marcel Grossmann Meeting on General Relativity and Gravitation, Jul 2009, Paris, France. ⟨hal-00461637⟩
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