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SFP 38
Parité Science

Accueil > Événements > Actualités > Séminaire

Séminaire théorie

Paolo Politi (Istituto dei Sistemi Complessi, CNR, Florence)
Conservation laws and nonequilibrium dynamics
Lieu : Amphithéâtre, maison des Magistères,
le vendredi 2 mars 2018 à 11h00
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One of the simplest examples of nonequilibrium dynamics varying in the presence of a conservation law is the coarsening process of the kinetic Ising model, whose exponent changes from 1/2 to 1/3 if the magnetization is conserved. We start showing that this difference may be strongly enhanced by increasing the interaction range of the ferromagnetic coupling, which determines a speed-up in nonconserved coarsening while it almost freezes conserved coarsening [1]. Conserved quantities are also relevant to obtain a condensation-like transition in non interacting systems: we will discuss the relaxation process of a simple model, which may be considered as a rough approximation of the Discrete Nonlinear Schroedinger Equation [2], whose dynamics is actually much, much slower. One more time, this last feature might be related to an almost conserved third quantity. [1] Federico Corberi, Eugenio Lippiello and Paolo Politi Effective mobility and diffusivity in coarsening processes EPL 119, 26005 (2017) [2] Stefano Iubini, Antonio Politi and Paolo Politi Relaxation and coarsening of weakly-interacting breathers in a simplified DNLS chain J. Stat. Mech.: Theory and Experiments, 073201 (2017)

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