The Week-Chandler-Anderson (WCA) model for Lennard-Jones liquid shows that at high densities the structure of the liquid depends mostly on repulsive interactions, and attractive interaction has a small perturbation effect. Recent studies on the WCA model of the glass-forming binary mixture at high density supercooled state shows that even at high densities and at low temperatures the dynamics of the binary mixture and its WCA model have difference in the relaxation dynamics of the system, and only at very high densities their dynamics approaches each other. In this study, we show that when the mean force experienced by a particle are the same the relaxation dynamics of the system are the same. The mean force is a measure of the degree of caging of a particle as supercooling increases. Thus, we provide a microscopic origin of the observed difference in the relaxation dynamics.
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