Liouville first passage percolation: geodesic length exponent is strictly larger than 1 at high temperatures

TL;DR

This paper demonstrates that in Liouville first passage percolation on a 2D Gaussian free field, the geodesic length exponent exceeds 1 at high temperatures, indicating superlinear growth of geodesic lengths.

Contribution

It proves that for small positive gamma, the geodesic length exponent in Liouville FPP is strictly greater than 1 with high probability as the domain size grows.

Findings

Geodesic length exponent exceeds 1 at high temperatures.

All macroscopic geodesics have superlinear length growth.

The result holds with probability tending to 1 as N increases.

Abstract

Let $\{\eta(v): v\in V_N\}$ be a discrete Gaussian free field in a two-dimensional box $V_N$ of side length $N$ with Dirichlet boundary conditions. We study the Liouville first passage percolation, i.e., the shortest path metric where each vertex is given a weight of $e^{\gamma \eta(v)}$ for some $\gamma>0$. We show that for sufficiently small but fixed $\gamma>0$, with probability tending to $1$ as $N\to \infty$, all geodesics between vertices of macroscopic Euclidean distances simultaneously have (the conjecturally unique) length exponent strictly larger than 1.