Spectrum of definite type of self-adjoint operators in Krein spaces

Langer, Heinz and Langer, Matthias and Markus, Alexander and Tretter, Christiane (2005) Spectrum of definite type of self-adjoint operators in Krein spaces. Linear and Multilinear Algebra, 53 (2). pp. 115-136. ISSN 0308-1087

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Abstract

For a self-adjoint operator in a Krein space we construct an interval [ν, μ] outside of which the operator has only a spectrum of definite type and possesses a local spectral function. As a consequence, a spectral subspace corresponding to an interval outside [ν, μ] admits an angular operator representation. We describe a defect subspace of the domain of the angular operator in terms of the Schur complement, and we derive variational principles for the discrete eigenvalues in such intervals of definite type.

Author(s):Langer, Heinz, Langer, Matthias, Markus, Alexander and Tretter, Christiane
Item type:Article
ID code:2236
Keywords:Krein space, spectrum of definite type, local spectral function, quadratic numerical range, variational principle for eigenvalues, Mathematics, Algebra and Number Theory
Subjects:Science > Mathematics
Department:Faculty of Science > Mathematics and Statistics
Depositing user: Strathprints Administrator
Date deposited:01 Dec 2006
Last modified:03 Jan 2019 11:24
URI:https://strathprints.strath.ac.uk/id/eprint/2236
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