Mathematics – Spectral Theory
Scientific paper
2011-12-09
Mathematics
Spectral Theory
14 pages, 2 figures
Scientific paper
We study the variation of the discrete spectrum of a bounded non-negative operator in a Krein space under a non-negative Schatten class perturbation of order $p$. It turns out that there exist so-called extended enumerations of discrete eigenvalues of the unperturbed and the perturbed operator, respectively, whose difference is an $\ell^p$-sequence. This result is a Krein space version of a theorem by T.Kato for bounded selfadjoint operators in Hilbert spaces.
Behrndt Jussi
Leben Leslie
Philipp Friedrich
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