Mean-Field Equations for Spin Models with Orthogonal Interaction Matrices

Abstract

We study the metastable states in Ising spin models with orthogonal interaction matrices. We focus on three realizations of this model, the random case and two non-random cases, i.e.\ the fully-frustrated model on an infinite dimensional hypercube and the so-called sine-model. We use the mean-field (or {\sc tap}) equations which we derive by resuming the high-temperature expansion of the Gibbs free energy. In some special non-random cases, we can find the absolute minimum of the free energy. For the random case we compute the average number of solutions to the {\sc tap} equations. We find that the configurational entropy (or complexity) is extensive in the range $T_{\mbox{\tiny RSB}}<T<T_{\mbox{\tiny M}}$. Finally we present an apparently unrelated replica calculation which reproduces the analytical expression for the total number of {\sc tap} solutions.

22+3 pages, section 5 slightly modified, 1 Ref added, LaTeX and uuencoded figures now independent of each other (easier to print). Postscript available http://chimera.roma1.infn.it/index_papers_complex.html

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