Abstract
We calculated with a molecular dynamics simulation the aging rates in a binary Lennard-Jones glass and its undercooled melt. At temperatures above the mode coupling theory (MCT) critical temperature ${T}_{c}$, pressure or volume, internal energy, and diffusivity age with the same rate. Below ${T}_{c}$ we see a split of the aging rates into a fast one for the diffusivity and a much slower one for pressure or volume and internal energy. The latter aging rate is roughly proportional to the diffusivity. The observed stretched exponential behavior is shown to stem from the faster aging of the diffusivity. Aging of of internal energy and pressure proceeds exponentially with the mean-square displacement. The exponential prefactor exhibits the kink at ${T}_{c}$ seen earlier in the pressure dependence of the diffusivity.
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