Aging Effects in a Lennard-Jones Glass

Using molecular dynamics simulations we study the out of equilibrium dynamic correlations in a model glass-forming liquid. The system is quenched from a high temperature to a temperature below its glass transition temperature and the decay of the two-time intermediate scattering function C (tₖ, t+tₖ) is monitored for several values of the waiting time tₖ after the quench. We find that C (tₖ, t+tₖ) shows a strong dependence on the waiting time, i. e. , aging, depends on the temperature before the quench, and, similar to the case of spin glasses, can be scaled onto a master curve.