Models with interactions that decay weakly with distance
by
Stefano Ruffo(FI)
→
Europe/Rome
248 (Building C, First Floor)
248
Building C, First Floor
Description
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.
