Abstract
Swendsen-Wang-type cluster dynamics is used in order to reduce relaxation time in spin-glass simulations. The shapes and sizes of the clusters are related to the local environment of the spins using dynamical information. For a Gaussian spin glass on a square lattice, the relaxation times are fitted by the Arrhenius form, exp(A/kT). The constant A for the cluster dynamics is found to be 5 times smaller than the one for conventional dynamics. We also obtain ν=2.0±0.2.

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