Shear Stress Correlations in Hard and Soft Sphere Fluids

Details Shear Stress Correlations in Hard and Soft Sphere Fluids Shear Stress Correlations in Hard and Soft Sphere Fluids

2001-09-15

arxiv.org/abs/cond-mat/0109281v1

Physics

Condensed Matter

Statistical Mechanics

14 pages, 2 figures; submitted for special issue of Molecular Physics

Scientific paper

10.1080/00268970110109934

The shear stress autocorrelation function has been studied recently by molecular dynamics simulation using the 1/q^n potential for very large n. The results are analyzed and interpreted here by comparing them to the shear stress response function for hard spheres. It is shown that the hard sphere response function has a singular contribution and that this is reproduced accurately by the simulations for large n. A simple model for the stress autocorrelation function at finite n is proposed, based on the required hard sphere limiting form.

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