On the mixed even-spin Sherrington-Kirkpatrick model with ferromagnetic interaction

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Abstract

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.

Original languageEnglish (US)
Pages (from-to)63-83
Number of pages21
JournalAnnales de l'institut Henri Poincare (B) Probability and Statistics
Volume50
Issue number1
DOIs
StatePublished - Feb 2014

Keywords

  • Ferromagnetic interaction
  • Ghirlanda-Guerra identities
  • Parisi formula
  • Sherrington-Kirkpatrick model
  • Ultrametricity

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