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The self-dual point of the two-dimensional random-cluster model is critical for $q\geq 1$

Abstract : We prove a long-standing conjecture on random-cluster models, namely that the critical point for such models with parameter $q\geq1$ on the square lattice is equal to the self-dual point $p_{sd}(q) = \sqrt q /(1+\sqrt q)$. This gives a proof that the critical temperature of the $q$-state Potts model is equal to $\log (1+\sqrt q)$ for all $q\geq 2$. We further prove that the transition is sharp, meaning that there is exponential decay of correlations in the sub-critical phase. The techniques of this paper are rigorous and valid for all $q\geq 1$, in contrast to earlier methods valid only for certain given $q$. The proof extends to the triangular and the hexagonal lattices as well.
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Vincent Beffara, Hugo Duminil-Copin. The self-dual point of the two-dimensional random-cluster model is critical for $q\geq 1$. Probability Theory and Related Fields, Springer Verlag, 2012, 153 (3-4), pp.511 - 542. ⟨10.1007/s00440-011-0353-8⟩. ⟨ensl-00495872⟩

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