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The Critical Z-Invariant Ising Model via Dimers: Locality Property

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Abstract

We study a large class of critical two-dimensional Ising models, namely critical Z-invariant Ising models. Fisher (J Math Phys 7:1776–1781, 1966) introduced a correspondence between the Ising model and the dimer model on a decorated graph, thus setting dimer techniques as a powerful tool for understanding the Ising model. In this paper, we give a full description of the dimer model corresponding to the critical Z-invariant Ising model, consisting of explicit expressions which only depend on the local geometry of the underlying isoradial graph. Our main result is an explicit local formula for the inverse Kasteleyn matrix, in the spirit of Kenyon (Invent Math 150(2):409–439, 2002), as a contour integral of the discrete exponential function of Mercat (Discrete period matrices and related topics, 2002) and Kenyon (Invent Math 150(2):409–439, 2002) multiplied by a local function. Using results of Boutillier and de Tilière (Prob Theor Rel Fields 147(3–4):379–413, 2010) and techniques of de Tilière (Prob Th Rel Fields 137(3–4):487–518, 2007) and Kenyon (Invent Math 150(2):409–439, 2002), this yields an explicit local formula for a natural Gibbs measure, and a local formula for the free energy. As a corollary, we recover Baxter’s formula for the free energy of the critical Z-invariant Ising model (Baxter, in Exactly solved models in statistical mechanics, Academic Press, London, 1982), and thus a new proof of it. The latter is equal, up to a constant, to the logarithm of the normalized determinant of the Laplacian obtained in Kenyon (Invent Math 150(2):409–439, 2002).

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Authors and Affiliations

  1. Laboratoire de Probabilités et Modèles Aléatoires, Université Paris VI Pierre et Marie Curie, Case courrier 188, 4 place Jussieu, F-75252, Paris Cedex 05, France

    Cédric Boutillier & Béatrice de Tilière

  2. École Normale Supérieure, DMA, 45 rue d’Ulm, 75005, Paris, France

    Cédric Boutillier

  3. Institut de Mathématiques, Université de Neuchâtel, Rue Emile-Argand 11, CH-2007, Neuchâtel, Switzerland

    Béatrice de Tilière

Authors
  1. Cédric Boutillier
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  2. Béatrice de Tilière
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Correspondence to Béatrice de Tilière.

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Communicated by S. Smirnov

Supported in part by the Swiss National Foundation Grant 200020-120218/1.

Supported in part by the Swiss National Foundations grants 47102009 and 200020-120218/1.

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Boutillier, C., de Tilière, B. The Critical Z-Invariant Ising Model via Dimers: Locality Property. Commun. Math. Phys. 301, 473–516 (2011). https://doi.org/10.1007/s00220-010-1151-3

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  • DOI: https://doi.org/10.1007/s00220-010-1151-3

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