Accumulation of complex eigenvalues of a class of analytic operator functions

Engström, Christian; Torshage, Johan Axel (2018). Accumulation of complex eigenvalues of a class of analytic operator functions. Journal of functional analysis, 275(2), pp. 442-477. Elsevier 10.1016/j.jfa.2018.03.019

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For analytic operator functions, we prove accumulation of branches of complex eigenvalues to the essential spectrum. Moreover, we show minimality and completeness of the corresponding system of eigenvectors and associated vectors. These results are used to prove sufficient conditions for eigenvalue accumulation to the poles and to infinity of rational operator functions. Finally, an application of electromagnetic field theory is given.

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