Nonequilibrium Langevin dynamics: A demonstration study of shear flow fluctuations in a simple fluid

doi:http://dx.doi.org/10.1103/PhysRevE.96.022125

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	Belousov, R; Cohen, EGD; Rondoni, L; Belousov, R (reprint author), Rockefeller Univ, New York, NY 10065 USA.
	Nonequilibrium Langevin dynamics: A demonstration study of shear flow fluctuations in a simple fluid
发表期刊	PHYSICAL REVIEW E
语种	英语
摘要	The present paper is based on a recent success of the second-order stochastic fluctuation theory in describing time autocorrelations of equilibrium and nonequilibrium physical systems. In particular, it was shown to yield values of the related deterministic parameters of the Langevin equation for a Couette flow in a microscopic molecular dynamics model of a simple fluid. In this paper we find all the remaining constants of the stochastic dynamics, which then is simulated numerically and compared directly with the original physical system. By using these data, we study in detail the accuracy and precision of a second-order Langevin model for nonequilibrium physical systems theoretically and computationally. We find an intriguing relation between an applied external force and cumulants of the resulting flow fluctuations. This is characterized by a linear dependence of an athermal cumulant ratio, an apposite quantity introduced here. In addition, we discuss how the order of a given Langevin dynamics can be raised systematically by introducing colored noise.
	2017
卷号	96 期号:2 页码:22125
学科领域	Physics
DOI	http://dx.doi.org/10.1103/PhysRevE.96.022125
引用统计	正在获取...
文献类型	期刊论文
条目标识符	http://ir.itp.ac.cn/handle/311006/21990
专题	SCI期刊论文
通讯作者	Belousov, R (reprint author), Rockefeller Univ, New York, NY 10065 USA.
推荐引用方式 GB/T 7714	Belousov, R,Cohen, EGD,Rondoni, L,et al. Nonequilibrium Langevin dynamics: A demonstration study of shear flow fluctuations in a simple fluid[J]. PHYSICAL REVIEW E,2017,96(2):22125.
APA	Belousov, R,Cohen, EGD,Rondoni, L,&Belousov, R .(2017).Nonequilibrium Langevin dynamics: A demonstration study of shear flow fluctuations in a simple fluid.PHYSICAL REVIEW E,96(2),22125.
MLA	Belousov, R,et al."Nonequilibrium Langevin dynamics: A demonstration study of shear flow fluctuations in a simple fluid".PHYSICAL REVIEW E 96.2(2017):22125.

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