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arXiv 2102.12873math.PRmath-phmath.MP
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自由边界二聚体:随机游动表示和标度极限

Free boundary dimers: random walk representation and scaling limit

Nathanael Berestycki, Marcin Lis, Wei Qian

摘要:

本文研究了正方形格的子图上的二聚体模型,在这个子图中,给定的一部分边界(自由边界)上的顶点可能是不匹配的。每个这样的不匹配的顶点被称为单体,并对配置的总重量贡献固定的乘法重量$z>0$。Giuliani,Jauslin和Lieb描述的双射将该模型与标准二聚体模型联系起来,但在非二部图上。该二聚体模型的Kasteleyn矩阵描述了沿着自由边界具有负转移权重的行走。然而,在某些假设下,这是特别满意的上半平面的无限体积限制,我们证明了一个有效的,真正的随机游动表示逆Kasteleyn矩阵。在这种情况下,我们进一步表明,独立的值的$z>0$,高度函数的缩放限制是高斯自由场与诺依曼(或自由)边界条件,从而回答了朱利安尼等人的问题。

英文摘要:

We study the dimer model on subgraphs of the square lattice in which vertices on a prescribed part of the boundary (the free boundary) are possibly unmatched. Each such unmatched vertex is called a monomer and contributes a fixed multiplicative weight $z>0$ to the total weight of the configuration. A bijection described by Giuliani, Jauslin and Lieb relates this model to a standard dimer model but on a non-bipartite graph. The Kasteleyn matrix of this dimer model describes a walk with transition weights that are negative along the free boundary. Yet under certain assumptions, which are in particular satisfied in the infinite volume limit in the upper half-plane, we prove an effective, true random walk representation for the inverse Kasteleyn matrix. In this case we further show that, independently of the value of $z>0$, the scaling limit of the height function is the Gaussian free field with Neumann (or free) boundary conditions, thereby answering a question of Giuliani et al.

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