Joint spectra of spherical Aluthge transforms of commuting n-tuples of Hilbert space operators

Authors

Chafiq Benhida
Raul E. Curto
Sang Hoon Lee
Jasang Yoon, The University of Texas Rio Grande Valley

Document Type

Article

Publication Date

10-2019

Abstract

Let be a commuting n-tuple of operators on a Hilbert space , and let be its canonical joint polar decomposition (i.e. ⁎ ⁎ , a joint partial isometry, and ). The spherical Aluthge transform of T is the (necessarily commuting) n-tuple . We prove that , where denotes the Taylor spectrum. We do this in two stages: away from the origin, we use tools and techniques from criss-cross commutativity; at the origin, we show that the left invertibility of T or implies the invertibility of P. As a consequence, we can readily extend our main result to other spectral systems that rely on the Koszul complex for their definitions.

Comments

© 2019 Académie des sciences. Published by Elsevier Masson SAS. All rights reserved. Original published version available at https://doi.org/10.1016/j.crma.2019.10.003

Recommended Citation

Benhida, Chafiq, Raúl E. Curto, Sang Hoon Lee, and Jasang Yoon. 2019. “Joint Spectra of Spherical Aluthge Transforms of Commuting N-Tuples of Hilbert Space Operators.” Comptes Rendus Mathematique 357 (10): 799–802. https://doi.org/10.1016/j.crma.2019.10.003.

First Page

799

Last Page

802

Publication Title

Comptes Rendus Mathematique

DOI

10.1016/j.crma.2019.10.003