Abstract
Given a closed manifold M and a closed connected submanifold \(N\subset M\) of positive codimension, we study the Steklov spectrum of the domain \(\varOmega _\varepsilon \subset M\) obtained by removing the tubular neighborhood of size \(\varepsilon \) around N. All nonzero eigenvalues in the mid-frequency range tend to infinity at a rate which depends only on the codimension of N in M. Eigenvalues above the mid-frequency range are also described: they tend to infinity following an unbounded sequence of clusters. This construction is then applied to obtain manifolds with unbounded perimeter-normalized spectral gap and to show the necessity of using the injectivity radius in some known isoperimetric-type upper bounds.
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Acknowledgements
The author would like to thank Bruno Colbois and Jean Lagacé for reading an early version of the article and Léonard Tschanz and Bruno Colbois for helping with the multiplicity in the proof of Theorem 1.4. The author is supported by NSERC. This work is a part of the PhD thesis of the author under the supervision of Alexandre Girouard.
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Brisson, J. Tubular Excision and Steklov Eigenvalues. J Geom Anal 32, 166 (2022). https://doi.org/10.1007/s12220-022-00905-3
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DOI: https://doi.org/10.1007/s12220-022-00905-3