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Using molecular simulations, we identify microscopic relaxation events ofindividual particles in ageing structural glasses, and determine the fulldistribution of relaxation times. We find that the memory of the waiting time$t_w$ elapsed since the quench extends only up to the first relaxation event,while the distribution of all subsequent relaxation times (persistence times)follows a power law completely independent of history. Our results are inremarkable agreement with the well known phenomenological trap model of ageing.A continuous time random walk (CTRW) parametrized with the atomisticdistributions captures the entire bulk diffusion behavior and explains theapparent scaling of the relaxation dynamics with $t_w$ during ageing, as wellas observed deviations from perfect scaling.

Atomistic mechanism of physical ageing in glassy materials