Mechanism for the failure of the Edwards hypothesis in the Sherrington-Kirkpatrick spin glass

P. R. Eastham, Richard Blythe, A. J. Bray, M. A. Moore

Research output: Contribution to journalArticlepeer-review

Abstract

The dynamics of the Sherrington-Kirkpatrick model at T=0 starting from random spin configurations is considered. The metastable states reached by such dynamics are atypical of such states as a whole, in that the probability density of site energies, p(lambda), is small at lambda=0. Since virtually all metastable states have a much larger p(0), this behavior demonstrates a qualitative failure of the Edwards hypothesis. We look for its origins by modeling the changes in the site energies during the dynamics as a Markov process. We show how the small p(0) arises from features of the Markov process that have a clear physical basis in the spin glass, and hence explain the failure of the Edwards hypothesis.

Original languageEnglish
Article number020406
Pages (from-to)-
Number of pages4
JournalPhysical review B: Condensed matter and materials physics
Volume74
Issue number2
DOIs
Publication statusPublished - Jul 2006

Keywords

  • ZERO-TEMPERATURE DYNAMICS
  • GRANULAR MATTER
  • MODEL

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