arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2108.02407cond-mat.stat-mechcond-mat.dis-nncond-mat.soft
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无限维中的活性物质:Fokker-Planck方程和低密度下的动力学平均场论

Active matter in infinite dimensions: Fokker-Planck equation and dynamical mean-field theory at low density

Thibaut Arnoulx de Pirey, Alessandro Manacorda, Frédéric van Wijland, Francesco Zamponi

摘要:

我们通过比较多体动力学中两种强有力的方法:Fokker-Planck方程和动力学平均场论,研究了自推进粒子在无限维空间中的行为。在低密度和无限的持续时间的粒子的动力学是解决在稳态与这两种方法,从而证明了这两种方法的一致性,在一个范例的平衡系统。我们得到的对分布函数和有效的自推进到一阶密度的解析表达式,证实了在以前的文件中得到的结果,并将它们扩展到非单调的相互作用势的情况下。此外,我们还得到了活性硬球从平衡态弛豫到非平衡稳态的瞬态行为。我们的研究结果显示了如何集体动力学的影响相互作用的第一顺序的密度,并指出未来的方向进一步分析和数值解决这个问题。

英文摘要:

We investigate the behavior of self-propelled particles in infinite space dimensions by comparing two powerful approaches in many-body dynamics: the Fokker-Planck equation and dynamical mean-field theory. The dynamics of the particles at low densities and infinite persistence time is solved in the steady-state with both methods, thereby proving the consistency of the two approaches in a paradigmatic out-of-equilibrium system. We obtain the analytic expression for the pair distribution function and the effective self-propulsion to first order in the density, confirming the results obtained in a previous paper and extending them to the case of a non-monotonous interaction potential. Furthermore, we obtain the transient behavior of active hard spheres when relaxing from equilibrium to the nonequilibrium steady-state. Our results show how collective dynamics is affected by interactions to first order in the density, and point out future directions for further analytical and numerical solutions of this problem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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