On the mixed even-spin Sherrington-Kirkpatrick model with ferromagnetic interaction
Annales de l'I.H.P. Probabilités et statistiques, Volume 50 (2014) no. 1, pp. 63-83.

We study a spin system with both mixed even-spin Sherrington-Kirkpatrick (SK) couplings and Curie-Weiss (CW) interaction. Our main results are: (i) The thermodynamic limit of the free energy is given by a variational formula involving the free energy of the SK model with a change in the external field. (ii) In the presence of a centered Gaussian external field, the positivity of the overlap and the extended Ghirlanda-Guerra identities hold on a dense subset of the temperature parameters. (iii) We establish a general inequality between the magnetization and overlap. (iv) We construct a temperature region in which the magnetization can be quantitatively controlled and deduce different senses of convergence for the magnetization depending on whether the external field is present or not. Our approach is based on techniques from the study of the CW and SK models and results in convex analysis.

Nous étudions un système dont les spins ont à la fois des couplages du type Sherrington-Kirkpatrick (SK) et des interactions du type Curie-Weiss (CW). Nos principaux résultats sont les suivants : (i) la limite thermodynamique de l'énergie libre est donnée par une formule variationnelle impliquant l'énergie libre du modèle SK avec un changement dans le champ magnétique externe. (ii) En présence d'un champ extérieur Gaussien centré, le recouvrement est positif et les identités généralisées de Ghirlanda-Guerra sont valides pour un sous ensemble dense des paramètres de température. (iii) Nous établissons une inégalité générale entre l'aimantation et le recouvrement. (iv) Nous identifions un domaine de températures où l'aimantation peut être contrôlée quantitativement et nous déduisons plusieurs types de convergences pour l'aimantation en présence ou non d'un champ extérieur. Notre approche repose sur des méthodes développées pour l'étude des modèles CW et SK et sur des résultats d'analyse convexe.

DOI: 10.1214/12-AIHP521
Classification: 60K35, 82B44
Keywords: ferromagnetic interaction, Ghirlanda-Guerra identities, Parisi formula, Sherrington-Kirkpatrick model, ultrametricity
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Chen, Wei-Kuo. On the mixed even-spin Sherrington-Kirkpatrick model with ferromagnetic interaction. Annales de l'I.H.P. Probabilités et statistiques, Volume 50 (2014) no. 1, pp. 63-83. doi : 10.1214/12-AIHP521. http://archive.numdam.org/articles/10.1214/12-AIHP521/

[1] J. M. G. Amaro De Matos, A. E. Patrick and V. A. Zagrebnov. Random infinite-volume Gibbs states for the Curie-Weiss random field Ising model. J. Stat. Phys. 66 (1992) 139-164. | MR | Zbl

[2] D. Bertsekas. Nonlinear Programming, 2nd edition. Athena Scientific, Belmont, 1999. | Zbl

[3] A. Cadel and C. Rovira. The Sherrington Kirkpatrick model with ferromagnetic interaction. Rocky Mountain J. Math. 40 (2010) 1441-1471. | MR | Zbl

[4] W.-K. Chen. The Aizenman-Sims-Starr scheme and Parisi formula for mixed p-spin spherical models. Preprint, 2012. Available at arXiv:1204.5115. | Zbl

[5] W.-K. Chen and D. Panchenko. An approach to chaos in some mixed p-spin models. Probab. Theory Relat. Fields (2012) DOI:10.1007/s00440-012-0460-1. | MR | Zbl

[6] F. Comets, G. Giacomin and J. L. Lebowitz. The Sherrington-Kirkpatrick model with short range ferromagnetic interactions. C. R. Acad. Sci. Paris Sér. I Math. 328 (1999) 57-62. | MR | Zbl

[7] F. Comets, F. Guerra and F. L. Toninelli. The Ising-Sherrington-Kirkpatrick model in a magnetic field at high temperature. J. Stat. Phys. 120 (2005) 147-165. | MR | Zbl

[8] F. Guerra. Broken replica symmetry bounds in the mean field spin glass model. Comm. Math. Phys. 233 (2003) 1-12. | MR | Zbl

[9] F. Guerra and F. L. Toninelli. The thermodynamical limit in mean field spin glass model. Comm. Math. Phys. 230 (2002) 71-79. | MR | Zbl

[10] F. Guerra and F. L. Toninelli. The infinite volume limit in generalized mean field disordered models. Markov Process. Related Fields 9 (2003) 195-207. | MR | Zbl

[11] D. Panchenko. On the differentiability of the Parisi formula. Electron. Commun. Probab. 13 (2008) 241-247. | MR | Zbl

[12] D. Panchenko. A new representation of the Ghirlanda-Guerra identities with applications. Preprint, 2011. Available at arXiv:1108.0379.

[13] D. Panchenko. The Parisi ultrametricity conjecture. Ann. of Math. (2) 177 (2013) 383-393. | MR | Zbl

[14] D. Panchenko. The Parisi formula for mixed p-spin models. Preprint, 2011. Available at arXiv:1112.4409. | MR | Zbl

[15] R. Phelps. Convex Functions, Monotone Operators and Differentiability. Lecture Notes in Mathematics 1364. Springer, Berlin, 1989. | MR | Zbl

[16] A. W. Roberts and D. E. Varberg. Convex Functions. Pure and Applied Mathematics 57. Academic Press, New York, 1973. | MR | Zbl

[17] D. Sherrington and S. Kirkpatrick. Solvable model of a spin glass. Phys. Rev. Lett. 35 (1975) 1792-1796.

[18] M. Talagrand. Spin Glasses: A Challenge for Mathematicians. Cavity and Mean Field Models. Ergebnisse der Mathematik und ihrer Grenzgebiete. 3. Folge A Series of Modern Surveys in Mathematics 46. Springer, Berlin, 2003. | MR | Zbl

[19] M. Talagrand. The Parisi formula. Ann. of Math. (2) 163 (2006) 221-263. | MR | Zbl

[20] M. Talagrand. Parisi measures. J. Funct. Anal. 231 (2006) 269-286. | MR | Zbl

[21] M. Talagrand. Free energy of the spherical mean filed model. Probab. Theory Related Fields 134 (2006) 339-382. | MR | Zbl

[22] M. Talagrand. Mean Field Models for Spin Glasses. Volume I. Basic Examples. Ergebnisse der Mathematik und ihrer Grenzgebiete. 3. Folge. A Series of Modern Surveys in Mathematics 54. Springer, Berlin, 2010. | MR | Zbl

[23] M. Talagrand. Mean Field Models for Spin Glasses. Volume II. Advanced Replica-Symmetry and Low Temperature. Ergebnisse der Mathematik und ihrer Grenzgebiete. 3. Folge. A Series of Modern Surveys in Mathematics 55. Springer, Berlin, 2011. | MR | Zbl

[24] A. Toubol. About the original Sherrington-Kirkpatrick model of spin glasses. C. R. Acad. Sci. Paris Sér. I Math. 321 (1995) 617-622. | MR | Zbl

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