title: Phase ordering in disordered and inhomogeneous systems.
abstract: We study numerically the coarsening dynamics of the Ising model on a regular lattice with random bonds and on deterministic fractal substrates. We propose a unifying interpretation of the phase-ordering processes based on two classes of dynamical behaviors characterized by different growth laws of the ordered domain size, namely logarithmic or power law, respectively. It is conjectured that the interplay between these dynamical classes is regulated by the same topological feature that governs the presence or the absence of a finite-temperature phase transition.
authors.affiliation: Dipartimento di Fisica "E. R. Caianiello," and INFN, Gruppo Collegato di Salerno, and CNISM, Unità di Salerno, Università di Salerno, via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy.
authors.forename: Federico
authors.initials: F
authors.lastname: Corberi
authors.affiliation: Dipartimento di Fisica "E. R. Caianiello," and INFN, Gruppo Collegato di Salerno, and CNISM, Unità di Salerno, Università di Salerno, via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Zannetti
authors.affiliation: Department of Mathematics and Physics, Second University of Naples, Viale Lincoln 5, 81100 Caserta, Italy.
authors.forename: Eugenio
authors.initials: E
authors.lastname: Lippiello
authors.affiliation: Dipartimento di Fisica e Scienza della Terra, and INFN, Gruppo Collegato di Parma, Università di Parma, Parco Area delle Scienze 7/A, I-423100 Parma, Italy.
authors.forename: Raffaella
authors.initials: R
authors.lastname: Burioni
authors.affiliation: Centro S3, CNR-Istituto di Nanoscienze, Via Campi 213A, 41125 Modena, Italy and Dipartimento di Fisica Scienza della Terra, Università di Parma, Parco Area delle Scienze 7/A, I-43100 Parma, Italy.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Vezzani