The Weak Limit of Ising Models on Locally Tree-Like Graphs

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Statistics and Probability
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Montanari, Andrea
Mossel, Elchanan
Sly, Allan
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We consider the Ising model with inverse temperature β and without external field on sequences of graphs G n which converge locally to the k-regular tree. We show that for such graphs the Ising measure locally weakly converges to the symmetric mixture of the Ising model with + boundary conditions and the − boundary conditions on the k-regular tree with inverse temperature β. In the case where the graphs G n are expanders we derive a more detailed understanding by showing convergence of the Ising measure conditional on positive magnetization (sum of spins) to the + measure on the tree.

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2012-02-01
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Probability Theory and Related Fields
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