Theory Group Seminars

Models with interactions that decay weakly with distance

by Stefano Ruffo (FI)

248 (Building C, First Floor)


Building C, First Floor

Systems with long-range interactions, like gravitational, charged and dipolar systems, can be made extensive, but are intrinsically non additive. The violation of this basic property of thermodynamics is the origin of ensemble inequivalence, which in turn implies that specific heat can be negative in the microcanonical ensemble, temperature jumps may appear at microcanonical first order phase transitions, ergodicity is tipically broken. From the dynamical point of view, these systems can be trapped in long-lived quasi-stationary states whose lifetime diverges with system size. Realizing that such features are present for a wide class of models has renewed the interest in long-range interactions.