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Asymptotics for Christoffel functions associated to continuum Schrödinger operators

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published
<mark>Journal publication date</mark>1/09/2024
<mark>Journal</mark>Journal d'Analyse Mathématique
Issue number2
Volume153
Number of pages35
Pages (from-to)519-553
Publication StatusPublished
Early online date12/12/23
<mark>Original language</mark>English

Abstract

We prove asymptotics of the Christoffel function, λL(ξ), of a continuum Schrödinger operator for points in the interior of the essential spectrum under some mild conditions on the spectral measure. It is shown that LλL(ξ) has a limit and that this limit is given by the Radon–Nikodym derivative of the spectral measure with respect to the Martin measure. Combining this with a recently developed local criterion for universality limits at scale λL(ξ), we compute universality limits for continuum Schrödinger operators at scale L and obtain clock spacing of the eigenvalues of the finite range truncations.