Force autocorrelation function in linear response theory and the origin of friction
Chemical Physics
2009-11-13 v1
Abstract
Vanishing of the equilibrium Green-Kubo fluctuation expression for the friction coefficient of a massive particle moving in a finite-volume liquid is usually interpreted as an unphysical consequence of the finite volume. Here I show that it is a physical consequence of the finite mass of the rest of the system, which allows it to be dragged by the moving particle. As a consequence, it is sufficient to have two infinite masses in the liquid for the friction coefficient to be finite. In addition, I give the physical interpretation of different friction coefficients for two infinite-mass particles moving in the liquid.
Cite
@article{arxiv.0802.0318,
title = {Force autocorrelation function in linear response theory and the origin of friction},
author = {Janka Petravic},
journal= {arXiv preprint arXiv:0802.0318},
year = {2009}
}
Comments
24 pages text and figures