The critical temperature for the Ising model on planar doubly periodic graphs

David Cimasoni (Université de Genève)
Hugo Duminil-Copin (Université de Genève)


We provide a simple characterization of the critical temperature for the Ising model on an arbitrary planar doubly periodic weighted graph. More precisely, the critical inverse temperature $\beta$ for a graph $G$ with coupling constants $(J_e)_{e\in E(G)}$ is obtained as the unique solution of an algebraic equation in the variables $(\tanh(\beta J_e))_{e\in E(G)}$. This is achieved by studying the high-temperature expansion of the model using Kac-Ward matrices.

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Pages: 1-18

Publication Date: March 28, 2013

DOI: 10.1214/EJP.v18-2352


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