Asymptotics of block Toeplitz determinants with piecewise continuous symbols

We determine the asymptotics of the block Toeplitz determinants \(\det T_n(\phi)\) as \(n\to\infty\) for \(N\times N\) matrix-valued piecewise continuous functions \(\phi\) with a finitely many jumps under mild additional conditions. In particular, we prove that $$ \det T_n(\phi) \sim G^n n^\Omega E...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2024-07
Main Authors: Basor, E, Ehrhardt, T, Virtanen, J A
Format: Article
Language:English
Subjects:
Asymptotic properties
Continuity (mathematics)
Operators (mathematics)
Symbols
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We determine the asymptotics of the block Toeplitz determinants \(\det T_n(\phi)\) as \(n\to\infty\) for \(N\times N\) matrix-valued piecewise continuous functions \(\phi\) with a finitely many jumps under mild additional conditions. In particular, we prove that $$ \det T_n(\phi) \sim G^n n^\Omega E\quad {\rm as}\ n\to \infty, $$ where \(G\), \(E\), and \(\Omega\) are constants that depend on the matrix symbol \(\phi\) and are described in our main results. Our approach is based on a new localization theorem for Toeplitz determinants, a new method of computing the Fredholm index of Toeplitz operators with piecewise continuous matrix-valued symbols, and other operator theoretic methods. As an application of our results, we consider piecewise continuous symbols that arise in the study of entanglement entropy in quantum spin chain models.
ISSN:2331-8422
DOI:10.48550/arxiv.2307.00825