Unit boundary length quantum disk: a study of two different perspectives and their equivalence

TL;DR

This paper proves the equivalence of two different probabilistic constructions of the unit boundary length quantum disk in Liouville Quantum Gravity, unifying perspectives from different research groups.

Contribution

It demonstrates that two distinct limiting procedures for defining the quantum disk yield the same probabilistic object, establishing their equivalence.

Findings

Both perspectives produce the same quantum disk object.

The limiting procedures are shown to be equivalent.

This unifies different approaches in the theory of quantum surfaces.

Abstract

The theory of the 2-dimensional Liouville Quantum Gravity, first introduced by Polyakov in his 1981 work has become a key notion in the study of random surfaces. In a series of articles, David, Huang, Kupiainen, Rhodes and Vargas, on the one hand, and Duplantier, Miller and Sheffield on the other hand, investigated this topic in the realm of probability theory, and both provided definitions for fundamentals objects of the theory: the unit area quantum sphere and the unit boundary length quantum disk. In a recent article, Aru, Huang and Sun showed that the definitions given in the case of the sphere coincide. We study here the two different perspectives provided for the unit boundary length quantum disk and show that they define the same probabilistic objects by considering two similar limiting procedures giving rise to them.