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Article Dans Une Revue Physical Review E : Statistical, Nonlinear, and Soft Matter Physics Année : 2004

Postcollapse dynamics of self-gravitating Brownian particles and bacterial populations

Résumé

We address the post-collapse dynamics of a self-gravitating gas of Brownian particles in D dimensions, in both canonical and microcanonical ensembles. In the canonical ensemble, the post-collapse evolution is marked by the formation of a Dirac peak with increasing mass. The density profile outside the peak evolves self-similarly with decreasing central density and increasing core radius. In the microcanonical ensemble, the post-collapse regime is marked by the formation of a ''binary\'\'-like structure surrounded by an almost uniform halo with high temperature. These results are consistent with thermodynamical predictions.

Dates et versions

hal-00004877 , version 1 (09-05-2005)

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Clément Sire, Pierre-Henri Chavanis. Postcollapse dynamics of self-gravitating Brownian particles and bacterial populations. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2004, 69, pp.066109. ⟨10.1103/PhysRevE.69.066109⟩. ⟨hal-00004877⟩
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