Long-range interacting systems

  • Date April 21, 2016
  • Hour 4 pm
  • Room GSSI Main Lecture Hall
  • Speaker Stefano Ruffo (SISSA)


Systems with long-range interactions (gravitational systems, charged and dipolar systems) can be made extensive, but are intrinsically non additive. The violation of this basic property of thermodynamics determines 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, long-lived quasi-stationary states appear, whose lifetime diverges with volume. Realizing that such features are present for a wide class of models has renewed in recent years the interest in long-range interactions.