UST branches, martingales, and multiple SLE(2)

Abstract

We identify the local scaling limit of multiple boundary-to-boundary branches in a uniform spanning tree (UST) as a local multiple SLE(2), i.e., an SLE(2) process weighted by a suitable partition function. By recent results, this also characterizes the "global" scaling limit of the full collection of full curves. The identification is based on a martingale observable in the UST with $N$ branches, obtained by weighting the well-known martingale in the UST with one branch by the discrete partition functions of the models. The obtained weighting transforms of the discrete martingales and the limiting SLE processes, respectively, only rely on a discrete domain Markov property and (essentially) the convergence of partition functions. We illustrate their generalizability by sketching an analogous convergence proof for a boundary-visiting UST branch and a boundary-visiting SLE(2).

34 pages, 2 figures. v2: Minor improvements. Final version; accepted for publication in Electronic Journal of Probability

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Cited by in corpus (4)

• Three phases of multiple SLE driven by non-colliding Dyson's Brownian motions
• Connection Probabilities of Multiple FK-Ising Interfaces
• Hypergeometric SLE with $\kappa =8$: Convergence of UST and LERW in Topological Rectangles
• Uniform Spanning Tree in Topological Polygons, Partition Functions for SLE(8), and Correlations in $c=-2$ Logarithmic CFT