“…In common to all of these systems are ultraslow relaxations that are characteristically different from relaxation in ordered systems, as they involve a very broad distribution of relaxation times and effective activation energies. So the associated energy landscape is rough as a result of randomness and/or frustration, and ergodicity is weakly broken [8].Another set of systems, in which aging is observed, shares a different kind of slow processes, which are related to growth [9,10], coarsening [11], diffusion, and subdiffusion [12,13], leading to a critical slowing of the dynamics, often with a similar type of dynamical scaling as in the first set of models. Aging in a Hamiltonian system of coupled rotators was also observed for conservative dynamics, remarkably without a thermal bath and without disorder or frustration [14], but for a particular family of initial conditions in the specific limits of infinite-range couplings, and the thermodynamic limit N → ∞ taken before the large time limit t → ∞.…”