Abstract
We study the dynamics of symmetric and asymmetric spin-glass models of size N. The analysis is in terms of the double empirical process: this contains both the spins, and the field felt by each spin, at a particular time (without any knowledge of the correlation history). It is demonstrated that in the large N limit, the dynamics of the double empirical process becomes deterministic and autonomous over finite time intervals. This does not contradict the well-known fact that SK spin-glass dynamics is non-Markovian (in the large N limit) because the empirical process has a topology that does not discern correlations in individual spins at different times. In the large N limit, the evolution of the density of the double empirical process approaches a nonlocal autonomous PDE operator \(\Phi _t\). Because the emergent dynamics is autonomous, in future work one will be able to apply PDE techniques to analyze bifurcations in \(\Phi _t\). Preliminary numerical results for the SK Glauber dynamics suggest that the ‘glassy dynamical phase transition’ occurs when a stable fixed point of the flow operator \(\Phi _t\) destabilizes.
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Notes
One should be able to adapt the methods of this paper to this setting.
Private communication.
A quick way to see why this formula holds is to note that the probability of a jump occurring over a small time interval is approximately exponentially distributed, i.e. \({\mathbb {P}}(|\sigma ^{i,j}_{\Delta } - \sigma ^{i,j}_0| > 0 \big ) \simeq c(\sigma ^{i,j}_0, G^{i,j}_0)\exp \big (-\Delta c(\sigma ^{i,j}_0, G^{i,j}_0)\big )\). Taking the ratio of two such densities, multiplying over many time intervals, and then taking \(\Delta \rightarrow 0\), we obtain the formula (124).
This satisfies all of the axioms of a metric, except that \(d_K(\mu ,\nu )=0\) does not necessarily imply that \(\mu =\nu \).
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Acknowledgements
Much thanks to Colin MacLaurin (U. Queensland) for obtaining some preliminary numerical results that were incorporated into the introduction. Much thanks also to Gerard Ben Arous (NYU), David Shirokoff (NJIT), Victor Matveev (NJIT), Bruno Cessac (INRIA) and Etienne Tanre (INRIA) for interesting discussions and very helpful feedback.
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MacLaurin, J. An emergent autonomous flow for mean-field spin glasses. Probab. Theory Relat. Fields 180, 365–438 (2021). https://doi.org/10.1007/s00440-021-01040-w
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DOI: https://doi.org/10.1007/s00440-021-01040-w