# Relating random matrix map enumeration to a universal symbol calculus for recurrence operators in terms of Bessel-Appell polynomials

## TL;DR

This paper develops a universal symbol calculus for recurrence operators related to map enumeration on Riemann surfaces, connecting random matrix spectral asymptotics with combinatorial generating functions through Bessel-Appell polynomials.

## Contribution

It introduces a novel asymptotic symbol calculus for difference operators, linking spectral asymptotics of random matrices with map enumeration via a universal, valence-independent framework.

## Key findings

- Closed form generating functions are universal across broad classes of cellular networks.
- Generating functions satisfy nonlinear conservation laws and their prolongations.
- Universality is connected to stability of characteristic singularities in conservation laws.

## Abstract

Maps are polygonal cellular networks on Riemann surfaces. This paper analyzes the construction of closed form general representations for the enumerative generating functions associated to maps of fixed but arbitrary genus. The method of construction developed here involves a novel asymptotic symbol calculus for difference operators based on the relation between spectral asymptotics for Hermitian random matrices and asymptotics of orthogonal polynomials with exponential weights. These closed form expressions have a universal character in the sense that they are independent of the explicit valence distribution of the cellular networks within a broad class. Nevertheless the valence distributions may be recovered from the closed form generating functions by a remarkable unwinding identity in terms of Appell polynomials generated by Bessel functions. Our treatment reveals the generating functions to be solutions of nonlinear conservation laws and their prolongations. This characterization enables one to gain insights that go beyond more traditional methods that are purely combinatorial. Universality results are connected to stability results for characteristic singularities of conservation laws that were studied by Caflisch, Ercolani, Hou and Landis as well as directly related to universality results for random matrix spectra.

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Source: https://tomesphere.com/paper/1907.08026