Retardation and flow at the glass transition

U. Buchenau

Published 2015-11-29Version 1

The crossover from back-and-forth jumps between structural minima to the no-return jumps of the viscous flow is modeled in terms of an ensemble of double-well potentials with a finite decay probability. The ensemble is characterized by the Kohlrausch-exponent $\beta$ of the time dependence $t^\beta$ of the response at short times. The model is applied to shear and dielectric data from the literature. It turns out to be necessary to assume a whole distribution of decay times around the average one, with a width of about a decade.