A Local Limit Theorem and Delocalization of Eigenvectors for Polynomials in Two Matrices

Abstract

We propose a boundary regularity condition for the $M_n(\mathbb{C})$-valued subordination functions in free probability to prove the local limit theorem and delocalization of eigenvectors for polynomials in two random matrices. We prove this through estimating the pair of $M_n(\mathbb{C})$-valued approximate subordination functions for the sum of two $M_n(\mathbb{C})$-valued random matrices ${\gamma }_1\otimes C_N+{\gamma }_2\otimes U_N^{\ast }{D}_N{U}_N$, where $C_N$, $D_N$ are deterministic diagonal matrices, and $U_N$ is Haar unitary.