The connection between statics and dynamics of spin glasses

TL;DR

This paper uses numerical simulations of a long-range 1D Ising spin glass to explore the relationship between static and dynamic properties, confirming theoretical predictions and measuring dynamic exponents in the mean-field regime.

Contribution

It provides numerical evidence linking static metastate predictions with dynamic correlation growth in a mean-field-like spin glass model.

Findings

Correlation decay matches RSB theory predictions

Dynamic exponent z(T) aligns with mean-field values

Growth of correlations follows t^{1/z(T)}

Abstract

We present results of numerical simulations on a one-dimensional Ising spin glass with long-range interactions. Parameters of the model are chosen such that it is a proxy for a short-range spin glass above the upper critical dimension (i.e. in the mean-field regime). The system is quenched to a temperature well below the transition temperature $T_c$ and the growth of correlations is observed. The spatial decay of the correlations at distances less than the dynamic correlation length $\xi(t)$ agrees quantitatively with the predictions of a static theory, the "metastate", evaluated according to the replica symmetry breaking (RSB) theory. We also compute the dynamic exponent $z(T)$ defined by $\xi(t) \propto t^{1/z(T)}$ and find that it is compatible with the mean-field value of the critical dynamical exponent for short range spin glasses.