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Zero-one law of orbital limit points for weighted shifts

Published online by Cambridge University Press:  07 April 2025

Antonio Bonilla
Affiliation:
Departamento de Análisis Matemático and Instituto de Matemáticas y Aplicaciones (IMAULL), Universidad de La Laguna, C/Astrofísico Francisco Sánchez, s/n, La Laguna, Tenerife, Spain
Rodrigo Cardeccia
Affiliation:
Departamento de Matemática, Instituto Balseiro, Universidad Nacional de Cuyo – C.N.E.A. and CONICET, San Carlos de Bariloche, Río Negro, Argentina
Karl-G. Grosse-Erdmann*
Affiliation:
Département de Mathématique, Université de Mons, 20 Place du Parc, Mons, Hainaut, Belgium
Santiago Muro
Affiliation:
FCEIA, Universidad Nacional de Rosario and CIFASIS, CONICET, Rosario, Santa Fe, Argentina
*
Corresponding author: Karl-G. Grosse-Erdmann, email: kg.grosse-erdmann@umons.ac.be

Abstract

Chan and Seceleanu have shown that if a weighted shift operator on $\ell^p(\mathbb{Z})$, $1\leq p \lt \infty$, admits an orbit with a non-zero limit point then it is hypercyclic. We present a new proof of this result that allows to extend it to very general sequence spaces. In a similar vein, we show that, in many sequence spaces, a weighted shift with a non-zero weakly sequentially recurrent vector has a dense set of such vectors, but an example on $c_0(\mathbb{Z})$ shows that such an operator is not necessarily hypercyclic. On the other hand, we obtain that weakly sequentially hypercyclic weighted shifts are hypercyclic. Chan and Seceleanu have, moreover, shown that if an adjoint multiplication operator on a Bergman space admits an orbit with a non-zero limit point then it is hypercyclic. We extend this result to very general spaces of analytic functions, including the Hardy spaces.

Information

Type
Research Article
Copyright
© The Author(s), 2025. Published by Cambridge University Press on Behalf of The Edinburgh Mathematical Society.

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