Mean field spin glasses treated with PDE techniques
2013 (English)In: European Physical Journal B: Condensed Matter Physics, ISSN 1434-6028, E-ISSN 1434-6036, Vol. 86, no 7, 332Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2013. Vol. 86, no 7, 332
spin glass, partial differential equations, sherrington kirkpatrick, replica symmetry breaking
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:kth:diva-165797DOI: 10.1140/epjb/e2013-40334-6ISI: 000322175100036OAI: oai:DiVA.org:kth-165797DiVA: diva2:808830
Correction in: European Physical Journal B: Condensed Matter Physics, Volume: 88, Issue: 4, Article Number: 100