Regensburg 2010 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 30: Posters II
DY 30.12: Poster
Donnerstag, 25. März 2010, 16:00–18:00, Poster C
Thermodynamics of the Levy spin glass — •Katharina Janzen1, Andreas Engel1, and Marc Mezard2 — 1Uni Oldenburg — 2Universite Paris Sud, France
We investigate the freezing transition in a mean-field spin glass with Levy-distributed couplings. A regularized model where the coupling constants smaller than some cutoff є are subsumed into a Gaussian random variable can be studied by the replica symmetric (RS) cavity method for diluted spin glasses. Within the RS ansatz we determine the thermodynamic functions of the model and the deAlmeida-Thouless line signaling the breakdown of the RS assumption. Contrary to previous findings, in zero external field we do not find any stable replica-symmetric spin glass phase: the spin glass phase is always a replica-symmetry-broken phase.