A calculation of the spatial dependence of the pair friction tensors ζij(r12), (i, j=1,2) for two hard sphere solute particles in a hard sphere fluid is presented. The calculation is based on a kinetic theory expression for the pair friction tensor. The contribution from dynamically uncorrelated collisions is computed here. (We do not consider the contribution from correlated collisions, which are important at high density.) The friction tensor is found to have a significant dependence on the solute pair separation, which arises from static correlations among the bath and solute particles.
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Cukier et al. (1980) studied this question.
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