Abstract:The velocity autocorrelation function (VACF) encapsulates extensive information about the molecular-structural and hydrodynamic properties of a fluid. We address the following fundamental question: How well can a purely hydrodynamic model recover the molecular properties of a fluid as exhibited by the VACF? To this end, we develop a bona fide hydrodynamic theory of the tagged-particle VACF for simple fluids. Our approach is distinguished from previous efforts in two key ways: collective hydrodynamic modes are … Show more
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