%0 Journal Article
%T The critical temperature for the Ising model on planar doubly periodic graphs
%A David Cimasoni
%A Hugo Duminil-Copin
%J Mathematics
%D 2012
%I arXiv
%X 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 a linear 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.
%U http://arxiv.org/abs/1209.0951v1