Condensation with two constraints and disorder

Abstract : Motivated by the study of breathers in the disordered Discrete Non Linear Schr\"odinger equation, we study the uniform probability over the intersection of a simplex and an ellipsoid in $n$ dimensions, with quenched disorder in the definition of either the simplex or the ellipsoid. Unless the disorder is too strong, the phase diagram looks like the one without disorder, with a transition separating a fluid phase, where all variables have the same order of magnitude, and a condensed phase, where one variable is much larger than the others. We then show that the condensed phase exhibits "intermediate symmetry breaking": the site hosting the condensate is chosen neither uniformly at random, nor is it fixed by the disorder realization. In particular, the model mimicking the well-studied Discrete Non Linear Schr\"odinger model with frequency disorder shows a very weak symmetry breaking: all variables have a sizable probability to host the condensate (i.e. a breather in a DNLS setting), but its localization is still biased towards variables with a large linear frequency. Throughout the article, our heuristic arguments are complemented with direct Monte Carlo simulations.
Type de document :
Pré-publication, Document de travail
15 pages, 4 figures. 2018
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Contributeur : Julien Barre <>
Soumis le : mercredi 17 janvier 2018 - 10:35:51
Dernière modification le : vendredi 18 janvier 2019 - 01:20:17



Léo Mangeolle, Julien Barre. Condensation with two constraints and disorder. 15 pages, 4 figures. 2018. 〈hal-01686212〉



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