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- W2951479227 abstract "We consider the meromorphic operator-valued function 1-K(z) = 1-A(z)/z where A(z) is holomorphic on the domain D, and has values in the class of compact operators acting in a given Hilbert space. Under the assumption that A(0) is a selfadjoint operator which can be of infinite rank, we study the distribution near the origin of the characteristic values of 1-K(z), i.e. the complex numbers w for which the operator 1-K(w) is not invertible, and we show that generically the characteristic values of 1-K(z) converge to 0 with the same rate as the eigenvalues of A(0). We apply our abstract results to the investigation of the resonances of the operator H = H_0 + V where H_0 is the shifted 3D Schrodinger operator with constant magnetic field of scalar intensity b>0, and V is a real electric potential which admits a suitable decay at infinity. It is well known that the spectrum of H_0 is purely absolutely continuous, coincides with [0,+infty[, and the so-called Landau levels 2bq with integer q, play the role of thresholds in the spectrum of H_0. We study the asymptotic distribution of the resonances near any given Landau level, and under generic assumptions obtain the main asymptotic term of the corresponding resonance counting function, written explicitly in the terms of appropriate Toeplitz operators." @default.
- W2951479227 created "2019-06-27" @default.
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- W2951479227 date "2014-01-01" @default.
- W2951479227 modified "2023-09-25" @default.
- W2951479227 title "Counting Function of Characteristic Values and Magnetic Resonances" @default.
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