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

被引：3

作者：

Roule, Mathieu ^{[1
]}

Fouvry, Jean-Baptiste ^{[1
]}

Pichon, Christophe ^{[1
,2
]}

Chavanis, Pierre-Henri ^{[3
]}

机构：

[1] Inst Astrophys Paris, UMR 7095, 98 bis Blvd Arago, F-75014 Paris, France

[2] CEA, DRF INP, IPhT, UMR 3680, Bat 774, F-91191 Gif Sur Yvette, France

[3] Univ Toulouse, Lab Phys Theor, CNRS, UPS, Toulouse, France

来源：

PHYSICAL REVIEW E | 2022年 / 106卷 / 04期

关键词：

STATISTICAL-MECHANICS; LINEAR-RESPONSE; DYNAMICS; DIFFUSION; STABILITY; EVOLUTION;

D O I：

10.1103/PhysRevE.106.044118

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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 similar to 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 quasikinetic blocking for the same equilibrium.

引用

页数：12

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