03-321 David Krejcirik, Rafael Tiedra de Aldecoa
The nature of the essential spectrum in curved quantum waveguides (69K, LaTeX) Jul 9, 03
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Abstract. We study the nature of the essential spectrum of the Dirichlet Laplacian in tubes of constant radius about infinite curves embedded in Euclidean spaces. Under suitable assumptions about the decay of curvatures at infinity, we prove the absence of singular continuous spectrum and state properties of possible embedded eigenvalues. The argument is based on Mourre conjugate operator method developed for acoustic multistratified domains by Benbernou and Dermenjian et al. As a technical preliminary, we carry out a spectral analysis for Schroedinger-type operators in straight Dirichlet tubes. We also apply the result to the strips embedded in abstract surfaces.

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