SpecialityIstituto dei Sistemi Complessi - CNR, Firenze, IT

Phase ordering in the presence of long-range interactionsPhase ordering is the relaxation process towards equilibrium following a temperature quench across a critical point. Here we discuss this phenomenon in magnetic systems with long-range interactions decaying with distance r as 1/r^a and we focus on the one-dimensional Ising model. With increasing the exponent a we pass from "pure" mean-field behavior for a=0 to a coarsening dynamics for a>1, where there is the formation and growth of ordered domains.