Cyclicity in rank-one perturbation problems
Abstract
The property of cyclicity of a linear operator, or equivalently the property of simplicity of its spectrum, is an important spectral characteristic that appears in many problems of functional analysis and applications to mathematical physics. In this paper we study cyclicity in the context of rank-one perturbation problems for self-adjoint and unitary operators. We show that for a fixed non-zero vector the property of being a cyclic vector is not rare, in the sense that for any family of rank-one perturbations of self-adjoint or unitary operators acting on the space, that vector will be cyclic for every operator from the family, with a possible exception of a small set with respect to the parameter. We discuss applications of our results to Anderson-type Hamiltonians.
Cite
@article{arxiv.1111.3095,
title = {Cyclicity in rank-one perturbation problems},
author = {Evgeny Abakumov and Constanze Liaw and Alexei Poltoratski},
journal= {arXiv preprint arXiv:1111.3095},
year = {2014}
}
Comments
Accepted by Journal of the London Mathematical Society. 16 pages