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Dyson equation and eigenvalue statistics of random matrices

By: Alt, Johannes.
Material type: materialTypeLabelBookPublisher: IST Austria 2018Online resources: Click here to access online
Contents:
Biographical Sketch
List of Publications
Acknowledgments
Abstract
List of Tables
List of Figures
List of Symbols
List of Abbreviations
Chapter 1. Introduction
Chapter 2. Overview of the results
Chapter 3. The local semicircle law for random matrices with a fourfold symmetry
Chapter 4. Local law for random Gram matrices
Chapter 5. Singularities of the density of states of random Gram matrices
Chapter 6. Local inhomogeneous circular law
Chapter 7. Location of the spectrum of Kronecker random matrices
Chapter 8. The Dyson equation with linear self-energy: spectral bands, edges and cusps
Chapter 9. Correlated Random Matrices: Band Rigidity and Edge Universality
Bibliography
Summary: The eigenvalue density of many large random matrices is well approximated by a deterministic measure, the self-consistent density of states. In the present work, we show this behaviour for several classes of random matrices. In fact, we establish that, in each of these classes, the self-consistent density of states approximates the eigenvalue density of the random matrix on all scales slightly above the typical eigenvalue spacing. For large classes of random matrices, the self-consistent density of states exhibits several universal features. We prove that, under suitable assumptions, random Gram matrices and Hermitian random matrices with decaying correlations have a 1/3-Hölder continuous self-consistent density of states ρ on R, which is analytic, where it is positive, and has either a square root edge or a cubic root cusp, where it vanishes. We, thus, extend the validity of the corresponding result for Wigner-type matrices from [4, 5, 7]. We show that ρ is determined as the inverse Stieltjes transform of the normalized trace of the unique solution m(z) to the Dyson equation −m(z) −1 = z − a + S[m(z)] on C N×N with the constraint Im m(z) ≥ 0. Here, z lies in the complex upper half-plane, a is a self-adjoint element of C N×N and S is a positivity-preserving operator on C N×N encoding the first two moments of the random matrix. In order to analyze a possible limit of ρ for N → ∞ and address some applications in free probability theory, we also consider the Dyson equation on infinite dimensional von Neumann algebras. We present two applications to random matrices. We first establish that, under certain assumptions, large random matrices with independent entries have a rotationally symmetric self-consistent density of states which is supported on a centered disk in C. Moreover, it is infinitely often differentiable apart from a jump on the boundary of this disk. Second, we show edge universality at all regular (not necessarily extreme) spectral edges for Hermitian random matrices with decaying correlations.
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Thesis

Biographical Sketch

List of Publications

Acknowledgments

Abstract

List of Tables

List of Figures

List of Symbols

List of Abbreviations

Chapter 1. Introduction

Chapter 2. Overview of the results

Chapter 3. The local semicircle law for random matrices with a fourfold symmetry

Chapter 4. Local law for random Gram matrices

Chapter 5. Singularities of the density of states of random Gram matrices

Chapter 6. Local inhomogeneous circular law

Chapter 7. Location of the spectrum of Kronecker random matrices

Chapter 8. The Dyson equation with linear self-energy: spectral bands, edges and cusps

Chapter 9. Correlated Random Matrices: Band Rigidity and Edge Universality

Bibliography

The eigenvalue density of many large random matrices is well approximated by a deterministic measure, the self-consistent density of states. In the present work, we show this behaviour for several classes of random matrices. In fact, we establish that, in each of these classes, the self-consistent density of states approximates the eigenvalue density of the random matrix on all scales slightly above the typical eigenvalue spacing. For large classes of random matrices, the self-consistent density of states exhibits several universal features. We prove that, under suitable assumptions, random Gram matrices and Hermitian random matrices with decaying correlations have a 1/3-Hölder continuous self-consistent density of states ρ on R, which is analytic, where it is positive, and has either a square root edge or a cubic root cusp, where it vanishes. We, thus, extend the validity of the corresponding result for Wigner-type matrices from [4, 5, 7]. We show that ρ is determined as the inverse Stieltjes transform of the normalized trace of the unique solution m(z) to the Dyson equation −m(z) −1 = z − a + S[m(z)] on C N×N with the constraint Im m(z) ≥ 0. Here, z lies in the complex upper half-plane, a is a self-adjoint element of C N×N and S is a positivity-preserving operator on C N×N encoding the first two moments of the random matrix. In order to analyze a possible limit of ρ for N → ∞ and address some applications in free probability theory, we also consider the Dyson equation on infinite dimensional von Neumann algebras. We present two applications to random matrices. We first establish that, under certain assumptions, large random matrices with independent entries have a rotationally symmetric self-consistent density of states which is supported on a centered disk in C. Moreover, it is infinitely often differentiable apart from a jump on the boundary of this disk. Second, we show edge universality at all regular (not necessarily extreme) spectral edges for Hermitian random matrices with decaying correlations.

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