Large $N$ expansions for the Laguerre and Jacobi $\beta$ ensembles from the loop equations

TL;DR

This paper derives the full hierarchy of loop equations for Laguerre and Jacobi beta ensembles using Aomoto's method, enabling systematic construction of the 1/N expansion and explicit correction terms to the global density.

Contribution

It introduces a systematic approach to derive the 1/N expansion for Laguerre and Jacobi beta ensembles using loop equations and Aomoto's method, providing explicit correction terms.

Findings

Explicit form of 1/N corrections to the global density

Systematic construction of low-order correlator expansions

Enhanced computational methods for moments in quantum transport

Abstract

The $\beta$-ensembles of random matrix theory with classical weights have many special properties. One is that the loop equations specifying the resolvent and corresponding multipoint correlators permit a derivation at general order of the correlator via Aomoto's method from the theory of the Selberg integral. We use Aomoto's method to derive the full hierarchy of loop equations for Laguerre and Jacobi $\beta$ ensembles, and use these to systematically construct the explicit form of the $1/N$ expansion at low orders. This allows us to give the explicit form of corrections to the global density, and allows various moments to be computed, complementing results available in the literature motivated by problems in quantum transport.