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Mean field spin glasses treated with PDE techniques
Dipartimento di Fisica, Sapienza Università di Roma, P.le Aldo Moro 5, Rome, Italy.
KTH, Skolan för datavetenskap och kommunikation (CSC), Beräkningsbiologi, CB.ORCID-id: 0000-0002-1252-2899
Dipartimento di Matematica, Sapienza Università di Roma, P.le Aldo Moro 5, Rome, Italy.
2013 (Engelska)Ingår i: European Physical Journal B: Condensed Matter Physics, ISSN 1434-6028, E-ISSN 1434-6036, Vol. 86, nr 7, artikel-id 332Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Following an original idea of F. Guerra, in this notes we analyze the Sherrington-Kirkpatrick model from different perspectives, all sharing the underlying approach which consists in linking the resolution of the sta- tistical mechanics of the model (e.g. solving for the free energy) to well-known partial differential equation (PDE) problems (in suitable spaces). The plan is then to solve the related PDE using techniques involved in their native field and lastly bringing back the solution in the proper statistical mechanics framework. Within this strand, after a streamlined test-case on the Curie-Weiss model to highlight the methods more than the physics behind, we solve the SK both at the replica symmetric and at the 1-RSB level, obtaining the correct expression for the free energy via an analogy to a Fourier equation and for the self-consistencies with an analogy to a Burger equation, whose shock wave develops exactly at critical noise level (triggering the phase transition).

Our approach, beyond acting as a new alternative method (with respect to the standard routes) for tackling the complexity of spin glasses, links symmetries in PDE theory with constraints in statistical mechanics and, as a novel result from the theoretical physics perspective, we obtain a new class of polynomial identities (namely of Aizenman-Contucci type, but merged within the Guerra’s broken replica measures), whose in- terest lies in understanding, via the recent Panchenko breakthroughs, how to force the overlap organization to the ultrametric tree predicted by Parisi. 

Ort, förlag, år, upplaga, sidor
Springer Berlin/Heidelberg, 2013. Vol. 86, nr 7, artikel-id 332
Nyckelord [en]
spin glass, partial differential equations, sherrington kirkpatrick, replica symmetry breaking
Nationell ämneskategori
Den kondenserade materiens fysik
Identifikatorer
URN: urn:nbn:se:kth:diva-165797DOI: 10.1140/epjb/e2013-40334-6ISI: 000322175100036OAI: oai:DiVA.org:kth-165797DiVA, id: diva2:808830
Projekt
NETADIS
Anmärkning

QC 20150506.

Correction in: European Physical Journal B: Condensed Matter Physics, Volume: 88, Issue: 4, Article Number: 100

DOI: 10.1140/epjb/e2015-60214-3

WOS:000352725700001

Tillgänglig från: 2015-04-29 Skapad: 2015-04-29 Senast uppdaterad: 2017-12-04Bibliografiskt granskad

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