2012/11/20 by Cédric Boutillier, Boutillier, Cédric, de Tilière, Béatrice · 1 citation
Mathematics · Physics and Astronomy · #82B20 #82B23 #FOS: Mathematics #FOS: Physical sciences #Mathematical Physics (math-ph) #Probability (math.PR) #Random Matrices and Applications #Stochastic processes and statistical mechanics #Theoretical and Computational Physics
paper · doi:10.48550/arxiv.1211.4825
openalex publication_date 2012/11/20 · openalex created_date 2022/10/01 · openalex updated_date 2026/07/28
The XOR-Ising model on a graph consists of random spin configurations on vertices of the graph obtained by taking the product at each vertex of the spins of two independent Ising models. In this paper, we explicitly relate loop configurations of the XOR-Ising model and those of a dimer model living on a decorated, bipartite version of the Ising graph. This result is proved for graphs embedded in compact surfaces of genus g. Using this fact, we then prove that XOR-Ising loops have the same law as level lines of the height function of this bipartite dimer model. At criticality, the height function is known to converge weakly in distribution to a Gaussian free field. As a consequence, results of this paper shed a light on the occurrence of the Gaussian free field in the XOR-Ising model. In particular, they prove a discrete analogue of Wilson's conjecture, stating that the scaling limit of XOR-Ising loops are "contour lines" of the Gaussian free field.