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Generalizations of Parisi’s replica symmetry breaking and overlaps in random energy models
[Généralisations de la brisure de symétrie des répliques de Parisi et des overlaps dans les modèles d’énergies aléatoires]
Comptes Rendus. Physique, Volume 25 (2024), pp. 329-351.

Cet article fait partie du numéro thématique Gérard Toulouse, une vie de découvertes et d'engagement coordonné par Bernard Derrida et al..

Le modèle d’énergies aléatoires (REM) est le modèle de verre de spin le plus simple qui présente une brisure de symétrie des répliques. Il est bien connu depuis les années 80 que ses overlaps ne sont pas automoyennants et que leurs statistiques sont celles prédites par la méthode des répliques. Ces propriétés statistiques peuvent être comprises en considérant que les niveaux d’énergie les plus bas sont les points générés par un processus de Poisson de densité exponentielle. Nous montrons ici dans un premier temps comment ces statistiques d’overlaps sont modifiées lorsqu’on remplace la densité exponentielle par une somme de deux exponentielles. Une façon de concilier ces résultats avec la théorie des répliques est de permettre aux blocs de la matrice de Parisi de fluctuer. D’autres exemples où la taille de ces blocs doit fluctuer incluent les corrections de taille finie du REM, le cas des énergies discrètes et les overlaps entre deux températures. Dans tous ces cas, non seulement la taille des blocs fluctue mais elle doit prendre des valeurs complexes si l’on souhaite reproduire nos résultats obtenus directement, c’est à dire sans utiliser la méthode des répliques.

The random energy model (REM) is the simplest spin glass model which exhibits replica symmetry breaking. It is well known since the 80’s that its overlaps are non-selfaveraging and that their statistics satisfy the predictions of the replica theory. All these statistical properties can be understood by considering that the low energy levels are the points generated by a Poisson process with an exponential density. Here we first show how, by replacing the exponential density by a sum of two exponentials, the overlaps statistics are modified. One way to reconcile these results with the replica theory is to allow the blocks in the Parisi matrix to fluctuate. Other examples where the sizes of these blocks should fluctuate include the finite size corrections of the REM, the case of discrete energies and the overlaps between two temperatures. In all these cases, the block sizes not only fluctuate but need to take complex values if one wishes to reproduce the results of our replica-free calculations.

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DOI : 10.5802/crphys.199
Keywords: Disordered systems, Spin glasses, Replica symmetry breaking, Random Energy Model
Mot clés : Systèmes désordonnés, Verres de spin, Brisure de symétrie des répliques, Modèle d’énergies aléatoires

Bernard Derrida 1, 2 ; Peter Mottishaw 3

1 Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France
2 Laboratoire de Physique de l’Ecole Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université de Paris, F-75005 Paris, France
3 SUPA, School of Physics and Astronomy, University of Edinburgh, Peter Guthrie Tait Road, Edinburgh EH9 3FD, United Kingdom
Licence : CC-BY 4.0
Droits d'auteur : Les auteurs conservent leurs droits
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Bernard Derrida; Peter Mottishaw. Generalizations of Parisi’s replica symmetry breaking and overlaps in random energy models. Comptes Rendus. Physique, Volume 25 (2024), pp. 329-351. doi : 10.5802/crphys.199. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.199/

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