Some remarks on spectra of nuclear operators

It was shown by M. I. Zelikin (2007) that the spectrum of a nuclear operator in a separable Hilbert space is central-symmetric iff the spectral traces of all odd powers of the operator equal zero. The criterium can not be extended to the case of general Banach spaces: It follows from Grothendieck-En...

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Bibliographic Details
Published in:arXiv.org 2018-03
Main Author: Reinov, Oleg I
Format: Article
Language:English
Subjects:
Banach spaces
Error analysis
Hilbert space
Linear operators
Quotients
Subspaces
Online Access:Get full text
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Summary:It was shown by M. I. Zelikin (2007) that the spectrum of a nuclear operator in a separable Hilbert space is central-symmetric iff the spectral traces of all odd powers of the operator equal zero. The criterium can not be extended to the case of general Banach spaces: It follows from Grothendieck-Enflo results that there exists a nuclear operator \(U\) in the space \(l_1\) with the property that \(\operatorname{trace}\, U=1\) and \(U^2=0.\) B. Mityagin (2016) has generalized Zelikin's criterium to the case of compact operators (in Banach spaces) some of which powers are nuclear. We give sharp generalizations of Zelikin's theorem (to the cases of subspaces of quotients of \(L_p\)-spaces) and of Mityagin's result (for the case where the operators are not necessarily compact).
ISSN:2331-8422