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Percolation on Triangulations: A Bijective Path to Liouville Quantum Gravity

About this Title

Olivier Bernardi, Nina Holden and Xin Sun

Publication: Memoirs of the American Mathematical Society
Publication Year: 2023; Volume 289, Number 1440
ISBNs: 978-1-4704-6699-2 (print); 978-1-4704-7626-7 (online)
DOI: https://doi.org/10.1090/memo/1440
Published electronically: August 24, 2023
Keywords: Liouville quantum gravity, Schramm-Loewner evolutions, mating of trees, percolation, random planar maps, triangulations, random walks, Kreweras walks, planar Brownian motion, bijection

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Table of Contents

Chapters

  • 1. Introduction
  • 2. A bijection between Kreweras walks and percolated triangulations
  • 3. Discrete dictionary I: Spine-looptrees decomposition
  • 4. Discrete dictionary II: Exploration tree
  • 5. Discrete dictionary III: tree of clusters, envelope excursions, and pivotal points
  • 6. Proofs of the bijective correspondences
  • 7. The mating-of-trees correspondence
  • 8. Convergence of percolated triangulations to $CLE_6$ on $\sqrt {8/3}$-LQG
  • 9. Proofs of the scaling limit results
  • A. Recovering the DFS tree and the walk from the percolated UIPT

Abstract

We set the foundation for a series of works aimed at proving strong relations between uniform random planar maps and Liouville quantum gravity (LQG). Our method relies on a bijective encoding of site-percolated planar triangulations by certain 2D lattice paths. Our bijection parallels in the discrete setting the mating-of-trees framework of LQG and Schramm-Loewner evolutions (SLE) introduced by Duplantier, Miller, and Sheffield. Combining these two correspondences allows us to relate uniform site-percolated triangulations to $\sqrt {8/3}$-LQG and SLE$_6$. In particular, we establish the convergence of several functionals of the percolation model to continuous random objects defined in terms of $\sqrt {8/3}$-LQG and SLE$_6$. For instance, we show that the exploration tree of the percolation converges to a branching SLE$_6$, and that the collection of percolation cycles converges to the conformal loop ensemble CLE$_6$. We also prove convergence of counting measure on the pivotal points of the percolation. Our results play an essential role in several other works, including a program for showing convergence of the conformal structure of uniform triangulations and works which study the behavior of random walk on the uniform infinite planar triangulation.

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