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math.SP2011
Spectral theory of elliptic differential operators with indefinite weights
Jussi Behrndt
The spectral properties of a class of non-selfadjoint second order elliptic operators with indefinite weight functions on unbounded domains are investigated. It is shown that u…
math.SP2011
Variation of discrete spectra of non-negative operators in Krein spaces
Jussi Behrndt, Leslie Leben, Friedrich Philipp
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 . It turns out that…