# Square-integrability of the Mirzakhani function and statistics of simple closed geodesics on hyperbolic surfaces

## TL;DR

This paper proves the square-integrability of the Mirzakhani function on moduli spaces of hyperbolic surfaces and explores its implications for counting simple closed geodesics.

## Contribution

It establishes the square-integrability of the Mirzakhani function and refines bounds near the cusp of moduli space, linking it to geodesic counting statistics.

## Key findings

- Proves the Mirzakhani function is square-integrable over moduli space.
- Provides improved bounds on the function near cusps.
- Connects the function's properties to statistical counting of geodesics.

## Abstract

Given integers $g,n \geq 0$ satisfying $2-2g-n < 0$, let $\mathcal{M}_{g,n}$ be the moduli space of connected, oriented, complete, finite area hyperbolic surfaces of genus $g$ with $n$ cusps. We study the global behavior of the Mirzakhani function $B \colon \mathcal{M}_{g,n} \to \mathbf{R}_{\geq 0}$ which assigns to $X \in \mathcal{M}_{g,n}$ the Thurston measure of the set of measured geodesic laminations on $X$ of hyperbolic length $\leq 1$. We improve bounds of Mirzakhani describing the behavior of this function near the cusp of $\mathcal{M}_{g,n}$ and deduce that $B$ is square-integrable with respect to the Weil-Petersson volume form. We relate this knowledge of $B$ to statistics of counting problems for simple closed hyperbolic geodesics.