arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.11635cond-mat.stat-mech
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一维自引力系统的慢动力学和遍历性

Slow dynamics and ergodicity in the one-dimensional self-gravitating system

L. F. Souza, T. M. Rocha Filho

摘要:

我们重新审视一维自引力片模型的动力学。我们证明了均匀态和非均匀态具有不同的遍历性。前者是非遍历的,如果对周期边界条件取适当的限制,单粒子分布函数具有零碰撞项。非均匀态在达到平衡的弛豫时间量级的时间窗口中是遍历的,这在具有长程相互作用的其他系统中也类似地观察到。对于片模型,如果与初始的剧烈弛豫时间相比,则该弛豫时间比具有长程相互作用的其他系统大得多。

英文摘要:

We revisit the dynamics of the one-dimensional self-gravitating sheets models. We show that homogeneous and non-homogeneous states have different ergodic properties. The former is non-ergodic and the one-particle distribution function has a zero collision term if a proper limit is taken for the periodic boundary conditions. Non-homogeneous states are ergodic in a time window of the order of the relaxation time to equilibrium, as similarly observe in other systems with a long range interaction. For the sheets model this relaxation time is much larger than other systems with long range interactions if compared to the initial violent relaxation time.

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