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Central Limit Theorem for Multi-Point Functions of the 2D Discrete Gaussian Model at high temperature
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abstract
We study microscopic observables of the Discrete Gaussian model (i.e., the Gaussian free field restricted to take integer values) at high temperature using the renormalisation group method. In particular, we show the central limit theorem for the two-point function of the Discrete Gaussian model by computing the asymptotic of the moment generating function $\langle e^{z (\sigma (0) - \sigma (y))} \rangle_{\beta, \mathbb{Z}^2}^{\dg}$ for $z \in \mathbb{C}$ sufficiently small. The method we use has direct connection with the multi-scale polymer expansion used in \cite{dgauss1, dgauss2}, where it was used to study the scaling limit of the Discrete Gaussian model. The method also applies to multi-point functions and lattice models of sine-Gordon type studied in \cite{MR634447}.
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