Critical Dynamics in a Binary Fluid: Simulations and Finite-size Scaling

Subir K. Das, Michael E. Fisher, Jan V. Sengers, Juergen Horbach, Kurt Binder

Published 2006-04-04Version 1

We report comprehensive simulations of the critical dynamics of a symmetric binary Lennard-Jones mixture near its consolute point. The self-diffusion coefficient exhibits no detectable anomaly. The data for the shear viscosity and the mutual-diffusion coefficient are fully consistent with the asymptotic power laws and amplitudes predicted by renormalization-group and mode-coupling theories {\it provided} finite-size effects and the background contribution to the relevant Onsager coefficient are suitably accounted for. This resolves a controversy raised by recent molecular simulations.