Abstract
The Mori method and the pseudo-Liouville formalism have been combined in an analysis of the translational and rotational diffusion coefficients of a dense fluid of hard bodies. Correlated recollisions, due to caging, appear naturally in this theory and their effect is to increase the translational friction on a tagged spherical molecule in a hard sphere bath and to increase the rotational friction on a hard nonspherical convex body in a hard sphere fluid. The calculated increase in friction from liquid state correlated caging corrections is in rough accord with the molecular dynamics calculation of Alder et al. on spherical systems and brings kinetic theory predictions for rotational friction coefficients in closer accord with experiment.
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