Fabio Staniscia

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We study the influence of the interaction range on the out-of-equilibrium
behavior of both isolated and thermostated systems.
In the case of short-range (extensive) systems, we investigate coarsening
dynamics. There we find the existence of a short-time regime where the
laws relating the rate of growth of domains' size with the interaction
range are different in isolated and thermostated systems.
In the case of long-range (non-extensive) systems, we focus on the
"Quasi-stationary states" in which these systems are trapped before
reaching the thermodynamic equilibrium.
There, we demonstrate that one can in principle measure negative specific
heat both in the case of isolated and thermostated systems.
This is a surprising result since for classical systems at equilibrium
negative specific heat can be found just in isolated systems, while it is
generally recognized that a positive specific heat should always be
measured in systems in contact with a thermal bath.

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Sincrotrone Trieste and Dipartimento di Fisica, Università di Trieste
Conference Room Theoretical Physics
Contact: not specified