Brownian motion from molecular dynamics
Chemical Physics
2015-05-20 v1 Statistical Mechanics
Abstract
Brownian motion of single particles with various masses M and diameters D is studied by molecular dynamics simulations. Besides the momentum auto-correlation function of the Brownian particle the memory function and the fluctuating force which enter the generalized Langevin equation of the Brownian particle are determined and their dependence on mass and diameter are investigated for two different fluid densities. Deviations of the fluctuating force distribution from a Gaussian form are observed for small particle diameters. For heavy particles the deviations of the fluctuating force from the total force acting on the Brownian particle decrease linearly with the mass ratio m/M where m denotes the mass of a fluid particle.
Cite
@article{arxiv.1010.4100,
title = {Brownian motion from molecular dynamics},
author = {Hyun Kyung Shin and Changho Kim and Peter Talkner and Eok Kyun Lee},
journal= {arXiv preprint arXiv:1010.4100},
year = {2015}
}