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Large deviations and continuum limit in the 2D Ising model 

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Published in  Probability Theory and Related Fields. 1997, vol. 109, no. 4, p. 435  506  
Abstract  We study the 2D Ising model in a rectangular box Λ L of linear size O(L). We determine the exact asymptotic behaviour of the large deviations of the magnetization ∑ t∈ΛL σ(t) when L→∞ for values of the parameters of the model corresponding to the phase coexistence region, where the order parameter m * is strictly positive. We study in particular boundary effects due to an arbitrary realvalued boundary magnetic field. Using the selfduality of the model a large part of the analysis consists in deriving properties of the covariance function <σ(0)σ(t)>, as t→∞, at dual values of the parameters of the model. To do this analysis we establish new results about the hightemperature representation of the model. These results are valid for dimensions D≥2 and up to the critical temperature. They give a complete nonperturbative exposition of the hightemperature representation. We then study the Gibbs measure conditioned by {∑ t∈Λ_L σ(t) −mΛ_L ≤Λ_L L^{−c} }, with 0<c<1/4 and −m *<m<m *. We construct the continuum limit of the model and describe the limit by the solutions of a variational problem of isoperimetric type.  
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Citation (ISO format)  PFISTER, C.E., VELENIK, Yvan. Large deviations and continuum limit in the 2D Ising model. In: Probability Theory and Related Fields, 1997, vol. 109, n° 4, p. 435  506. doi: 10.1007/s004400050139 https://archiveouverte.unige.ch/unige:6391 