Dynamical correlations in binary soft-sphere glasses

Abstract

Dynamical correlations in binary fluids are investigated by use of molecular dynamics simulations for soft-sphere mixtures. Longitudinal and transverse collective modes (sound waves) are studied by computing the dynamical structure factors and the Fourier transforms of the transverse current correlation function, respectively. The stress autocorrelation function is also computed. It is shown that the stress autocorrelation function exhibits characteristic slow relaxation phenomena (long-time tails) near and beyond the glass transition, compatible with the previous result obtained from the analysis of the density autocorrelation functions.