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Название: The Response of Glassy Systems to Random Perturbations: A Bridge Between Equilibrium and Off-Equilibrium
Авторы: Franz S., Mezard M.
We discuss the response of aging systems with short-range interactions to a class of random perturbations. Although these systems are out of equilibrium, the limit value of the free energy at long times is equal to the equilibrium free energy. By exploiting this fact, we define a new order parameter function, and we relate it to the ratio between response and fluctuation, which is in principle measurable in an aging experiment.