Ageing classification in glassy dynamics

We study the out-of-equilibrium dynamics of several models exhibiting ageing. We attempt to identify various types of ageing systems using a phase space point of view. We introduce a trial classification, based on the overlap between two replicas of a system, which evolve together until a certain waiting time, and are then totally decoupled. In this way we investigate two types of systems, domain growth problems and spin glasses, and we show that they behave differently.