Geodesic
Maxwell operator in a cylinder with coefficients that do not depend on the cross-sectional variables
Algebra i analiz, Tome 32 (2020) no. 1, pp. 187-207.

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The Maxwell operator is studied in a three-dimensional cylinder whose cross-section is a simply connected bounded domain with Lipschitz boundary. It is assumed that the coefficients of the operator are scalar functions depending on the longitudinal variable only. We show that the square of such an operator is unitarily equivalent to the orthogonal sum of four scalar elliptic operators of second order. If the coefficients are periodic along the axis of the cylinder, the spectrum of the Maxwell operator is absolutely continuous.
Keywords: Maxwell operator, simply connected cylinder, absolute continuity of the spectrum. 
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N. D. Filonov. Maxwell operator in a cylinder with coefficients that do not depend on the cross-sectional variables. Algebra i analiz, Tome 32 (2020) no. 1, pp. 187-207. http://geodesic.mathdoc.fr/item/AA_2020_32_1_a7/

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