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- W2074880970 abstract "The random cluster model on a general infinite graph with bounded degree wired at infinity is considered and a “ghost vertex” method is introduced in order to explicitly construct random cluster measures satisfying the Dobrushin–Lanford–Ruelle condition for q⩾1. It is proved that on a regular nonamenable graph there is a q0 such that for q⩾q0 there is a phase transition for an entire interval of values of p, whereas on a quasi-transitive amenable graph there is a phase transition for at most a countable number of values of p. In particular, a transitive graph is nonamenable if and only if there is a phase transition for an entire interval of p-values for large enough q. It is also observed that these results have a Potts model interpretation. In particular, a transitive graph is nonamenable if and only if the q-state Potts model on that graph has the property that for q large enough there is an entire interval of temperatures for which the free Gibbs state is not a convex combination of the q Gibbs states obtained from one-spin boundary conditions. It is also proved that on the regular tree, Tn, with q⩾1 and p close enough to 1, there is unique random cluster measure despite the presence of more than one infinite cluster. This partly proves Conjecture 1.9 of Häggström (1996)." @default.
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- W2074880970 title "The random cluster model on a general graph and a phase transition characterization of nonamenability" @default.
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