On the linearity of the self-diffusion process |
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Authors: | William W Wood Jerome J Erpenbeck |
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Institution: | (1) Los Alamos National Laboratory, University of California, 87545 Los Alamos, New Mexico;(2) Carroll College, 59601 Helena, Montana |
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Abstract: | Formal arguments are given that the self-diffusion process, understood as the mutual diffusion process in a system which consists of two mechanically similar species of particles, and which is at total equilibrium if the species labels are ignored, is an inherently linear, but nonlocal, transport process. There are no nonlinear Burnett effects, and the nonlocal diffusion coefficient is independent of the composition of the mixture. The present state of knowledge, from theory and from computer experiments, concerning the various quantities which appear in the formal analysis is summarized for both fluid and Lorentz systems.Work performed under contract with the U.S. Department of Energy. |
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Keywords: | Self-diffusion nonlocal effects long-time tails velocity autocorrelation function super-Burnett coefficient fluids Lorentz gas |
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