Spatial Markov property in Brownian disks

Jean-François Le Gall; Armand Riera

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arXiv · 2302.01138

Spatial Markov property in Brownian disks

Jean-François Le Gall·Armand Riera

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Abstract

We derive a new representation of the Brownian disk in terms of a forest of labeled trees, where labels correspond to distances from a subset of the boundary. We then use this representation to obtain a spatial Markov property showing that the complement of a hull centered at a boundary point of a Brownian disk is again a Brownian disk, with a random perimeter, and is independent of the hull conditionally on its perimeter. Our proofs rely in part on a study of the peeling process for triangulations with a boundary, which is of independent interest. The results of the present work will be applied to a continuous version of the peeling process for the Brownian half-plane in a companion paper.

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Jean-François Le Gall, Armand Riera. 2023-02-02. Spatial Markov property in Brownian disks. https://arxiv.org/abs/2302.01138

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