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The Discrete Gaussian model, II. Infinite-volume scaling limit at high temperature

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arxiv 2202.02287 v2 pith:KU5JF2S3 submitted 2022-02-04 math.PR math-phmath.MP

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keywords gaussiandiscretelimitmodelscalingfieldfreefunctions
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The Discrete Gaussian model is the lattice Gaussian free field conditioned to be integer-valued. In two dimensions, at sufficiently high temperature, we show that the scaling limit of the infinite-volume gradient Gibbs state with zero mean is a multiple of the Gaussian free field. This article is the second in a series on the Discrete Gaussian model, extending the methods of the first paper by the analysis of general external fields (rather than macroscopic test functions on the torus). As a byproduct, we also obtain a scaling limit for mesoscopic test functions on the torus.

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