Abstract
We calculate, through Monte Carlo (MC) numerical simulations, the partial total and direct correlation functions of the three dimensional symmetric Widom–Rowlinson mixture. We find that the differences between the partial direct correlation functions from simulation and from the Percus–Yevick approximation (calculated analytically by Ahn and Lebowitz) are well fitted by Gaussians. We provide an analytical expression for the fit parameters as function of the density. We also present MC simulation data for the direct correlation functions of a couple of non-additive hard sphere systems to discuss the modification induced by finite like diameters.
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