Force autocorrelation function in linear response theory and the origin of friction

Details Force autocorrelation function in linear response theory and the origin of friction Force autocorrelation function in linear response theory and the origin of friction

2008-02-04

arxiv.org/abs/0802.0318v1

Physics

Chemical Physics

24 pages text and figures

Scientific paper

10.1063/1.2972977

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.

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