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We study the nonequilibrium aging dynamics in a system of quasi-hard spheresat large density by means of computer simulations. We find that, after a suddenquench to large density, the relaxation time initially increases exponentiallywith the age of the system. After a surprisingly large crossover time, thesystem enters the asymptotic aging regime characterized by a linear increase ofthe relaxation time with age. In this aging regime, single particle motion isstrongly non-Fickian, with a mean-squared displacement increasingsubdiffusively, associated to broad, non-Gaussian tails in the distribution ofparticle displacements. We find that the system ages through temporallyintermittent relaxation events, and a detailed finite size analysis of thesecollective dynamic fluctuations reveals that these events are not spanning theentire system, but remain spatially localized.

Subdiffusion and intermittent dynamic fluctuations in the aging regime of concentrated hard spheres