Abstract
We study the fluctuations of random surfaces on a two-dimensional discrete torus. The random surfaces we consider are defined via a nearest-neighbor pair potential, which we require to be twice continuously differentiable on a (possibly infinite) interval and infinity outside of this interval. No convexity assumption is made and we include the case of the so-called hammock potential, when the random surface is uniformly chosen from the set of all surfaces satisfying a Lipschitz constraint. Our main result is that these surfaces delocalize, having fluctuations whose variance is at least of order log n, where n is the side length of the torus. We also show that the expected maximum of such surfaces is of order at least log n. The main tool in our analysis is an adaptation to the lattice setting of an algorithm of Richthammer, who developed a variant of a Mermin–Wagner-type argument applicable to hard-core constraints. We rely also on the reflection positivity of the random surface model. The result answers a question mentioned by Brascamp et al. on the hammock potential and a question of Velenik.
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Communicated by H. Spohn
Research of P.M. was partially supported by the Polish Ministry of Science and Higher Education Iuventus Plus Grant No. IP 2011 000171.
Research of R.P. is partially supported by an ISF grant and an IRG grant.
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Miłoś, P., Peled, R. Delocalization of Two-Dimensional Random Surfaces with Hard-Core Constraints. Commun. Math. Phys. 340, 1–46 (2015). https://doi.org/10.1007/s00220-015-2419-4
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DOI: https://doi.org/10.1007/s00220-015-2419-4