Comment on ``Antiferromagnetic Potts Models''
Abstract
We show that the Wang-Swendsen-Koteck\'y algorithm for antiferromagnetic q-state Potts models is nonergodic at zero temperature for q=3 on periodic 3m × 3n lattices where m,n are relatively prime. For q 4 and/or other lattice sizes or boundary conditions, the ergodicity at zero temperature is an open question.
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