Abstract
In 1956, Pleijel gave his celebrated theorem showing that the inequality in Courant’s theorem on the number of nodal domains is strict for large eigenvalues of the Laplacian. This was a consequence of a stronger result giving an asymptotic upper bound for the number of nodal domains of the eigenfunction as the eigenvalue tends to \(+\infty \). A similar question occurs naturally for the case of the Schrödinger operator. The first significant result has been obtained recently by the first author for the case of the harmonic oscilllator. The purpose of this paper is to consider more general potentials which are radial. We will analyze either the case when the potential tends to \(+\infty \) or the case when the potential tends to zero, the considered eigenfunctions being associated with the eigenvalues below the essential spectrum.
Résumé
En 1956, \(\AA \). Pleijel a démontré qu’il peut seulement y avoir un nombre fini d’égalités dans le théorème de Courant sur les fonctions propres du laplacien. Ce résultat était accompagné d’une borne supérieure sur le nombre de domaines nodaux des fonctions propres lorsque les valeurs propres tendent vers l’infini. Il est naturel de supposer qu’un résultat similaire peut être démontré dans le cas de l’opérateur de Schrödinger. Le premier résultat significatif dans cette direction a été obtenu par le premier auteur pour l’oscillateur harmonique. L’objectif de cet article est de traiter le cas de potentiels radiaux plus généraux. Nous traiterons les cas où le potentiel tend vers \(+\infty \) ou les cas où le potentiel tend vers zéro, les fonctions propres correspondant à la partie discrète du spectre.
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Acknowledgements
Thanks to the ESI where the paper was initiated (B. H. and T. H.-O.). The authors would also thank I. Polterovich for helpful discussions at various stages of this work.
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Charron, P., Helffer, B. & Hoffmann-Ostenhof, T. Pleijel’s theorem for Schrödinger operators with radial potentials. Ann. Math. Québec 42, 7–29 (2018). https://doi.org/10.1007/s40316-017-0078-x
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DOI: https://doi.org/10.1007/s40316-017-0078-x