Article Dans Une Revue Physical Review E Année : 2022

Long-term relaxation of one-dimensional self-gravitating systems

Résumé

We investigate the long-term relaxation of one-dimensional (${1D}$) self-gravitating systems, using both kinetic theory and $N$-body simulations. We consider thermal and Plummer equilibria, with and without collective effects. All combinations are found to be in clear agreement with respect to the Balescu-Lenard and Landau predictions for the diffusion coefficients. Interestingly, collective effects reduce the diffusion by a factor ${\sim 10}$. The predicted flux for Plummer equilibrium matches the measured one, which is a remarkable validation of kinetic theory. We also report on a situation of quasi kinetic blocking for the same equilibrium.

Dates et versions

hal-03797392 , version 1 (04-10-2022)

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Mathieu Roule, Jean-Baptiste Fouvry, Christophe Pichon, Pierre-Henri Chavanis. Long-term relaxation of one-dimensional self-gravitating systems. Physical Review E , 2022, 106 (4), pp.044118. ⟨10.1103/PhysRevE.106.044118⟩. ⟨hal-03797392⟩
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