A note on the spectrum of irreducible operators and semigroups
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- by Jochen Glück PDF
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Abstract:
Let $T$ denote a positive operator with spectral radius $1$ on, say, an $L^p$-space. A classical result in infinite dimensional Perron–Frobenius theory says that, if $T$ is irreducible and power bounded, then its peripheral point spectrum is either empty or a subgroup of the unit circle.
In this note we show that the analogous assertion for the entire peripheral spectrum fails. More precisely, for every finite union $U$ of finite subgroups of the unit circle we construct an irreducible stochastic operator on $\ell ^1$ whose peripheral spectrum equals $U$.
We also give a similar construction for the $C_0$-semigroup case.
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Additional Information
- Jochen Glück
- Affiliation: Universität Passau, Fakultät für Informatik und Mathematik, 94032 Passau, Germany
- ORCID: 0000-0002-0319-6913
- Email: jochen.glueck@uni-passau.de
- Received by editor(s): February 7, 2021
- Received by editor(s) in revised form: April 16, 2021, and April 20, 2021
- Published electronically: October 19, 2021
- Communicated by: Stephen Dilworth
- © Copyright 2021 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 150 (2022), 257-266
- MSC (2020): Primary 47B65; Secondary 47A10
- DOI: https://doi.org/10.1090/proc/15651
- MathSciNet review: 4335874
Dedicated: Dedicated with great pleasure to Rainer Nagel on the occasion of his 80th birthday