Abstract
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 liquid and for a Kob-Andersen Lennard-Jones mixture. Under this model, the lifetime of the heterogeneities has little effect on the position of the peak of , but it controls the decay of after the peak, and we show how to estimate it from this decay.
- Received 27 December 2022
- Revised 4 June 2023
- Accepted 24 October 2023
DOI:https://doi.org/10.1103/PhysRevLett.131.218202
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