Videos

On eigenvectors of perturbed Toeplitz matrices

Presenter
August 23, 2021
Keywords:
  • Eigenvector
  • Toeplitz matrices
  • pseudo-modes
MSC:
  • 60B20
  • 15B52
Abstract
We consider Toeplitz matrices perturbed by vanishing noise, i.e. noise of the form $N^{-\gamma} G$ with $\gamma>1/2$ and $G$ having iid zero mean entries of variance $1$; the resulting spectrum concentrates around spectral curves determined by the symbol. For $\gamma>1$, we prove localization of eigenvectors and show they are close to certain pseudo-modes. I will also discuss the case $\gamma\in (1/2,1)$, where a different behavior emerges. Joint work with Anirban Basak and Martin Vogel.