On the propagation of a perturbation in an anharmonic system
P. Buttà, E. Caglioti, S. Di Ruzza, C. Marchioro
Abstract
We give a not trivial upper bound on the velocity of disturbances in an infinitely extended anharmonic system at thermal equilibrium. The proof is achieved by combining a control on the non equilibrium dynamics with an explicit use of the state invariance with respect to the time evolution.
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