Irreducible metric maps and Weil-Petersson volumes

TL;DR

This paper introduces a new family of irreducible metric maps on surfaces, computes their volumes, and reveals a surprising connection to Weil-Petersson volumes for low genus cases, with implications for hyperbolic geometry.

Contribution

It defines irreducible metric maps with a eta-constraint, computes their volumes, and establishes a novel link to Weil-Petersson volumes for genus 0 and 1.

Findings

Volumes are homogeneous polynomials of degree 6g-6+2n.

For g=0,1 and eta=2",

the volumes match Weil-Petersson volumes up to powers of two.

Abstract

We consider maps on a surface of genus $g$ with all vertices of degree at least three and positive real lengths assigned to the edges. In particular, we study the family of such metric maps with fixed genus $g$ and fixed number $n$ of faces with circumferences $\alpha_1,\ldots,\alpha_n$ and a $\beta$-irreducibility constraint, which roughly requires that all contractible cycles have length at least $\beta$. Using recent results on the enumeration of discrete maps with an irreducibility constraint, we compute the volume $V_{g,n}^{(\beta)}(\alpha_1,\ldots,\alpha_n)$ of this family of maps that arises naturally from the Lebesgue measure on the edge lengths. It is shown to be a homogeneous polynomial in $\beta, \alpha_1,\ldots, \alpha_n$ of degree $6g-6+2n$ and to satisfy string and dilaton equations. Surprisingly, for $g=0,1$ and $\beta=2\pi$ the volume $V_{g,n}^{(2\pi)}$ is identical, up to powers of two, to the Weil-Petersson volume $V_{g,n}^{\mathrm{WP}}$ of hyperbolic surfaces of genus $g$ and $n$ geodesic boundary components of length $L_i = \sqrt{\alpha_i^2 - 4\pi^2}$, $i=1,\ldots,n$. For genus $g\geq 2$ the identity between the volumes fails, but we provide explicit generating functions for both types of volumes, demonstrating that they are closely related. Finally we discuss the possibility of bijective interpretations via hyperbolic polyhedra.