2 research outputs found
A simple model for dynamic heterogeneity in glass-forming liquids
Liquids near the glass transition exhibit dynamical heterogeneity, i.e. local
relaxation rates fluctuate strongly over space and time. Here we introduce a
simple continuum model that allows for quantitative predictions for the
correlators describing these fluctuations. We find remarkable agreement of the
model predictions for the dynamic susceptibility with numerical
results for a binary hard-sphere (HARD) liquid and for a Kob-Andersen
Lennard-Jones (KALJ) mixture. We explain why the existence and position of the
peak of provides no information about the lifetime
of the heterogeneities. We show that depends weakly on , but find a way to use this weak dependence to estimate
from .Comment: Main text: 5 pages, 3 figures. Supplemental material: 2 pages, 1
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