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A note on eigenvalue bounds for non-compact manifolds. (English) Zbl 1523.58032

Summary: In this article we prove upper bounds for the Laplace eigenvalues \(\lambda_k\) below the essential spectrum for strictly negatively curved Cartan-Hadamard manifolds. Our bound is given in terms of \(k^2\) and specific geometric data of the manifold. This applies also to the particular case of non-compact manifolds whose sectional curvature tends to \(- \infty\), where no essential spectrum is present due to a theorem of Donnelly/Li. The result stands in clear contrast to Laplacians on graphs where such a bound fails to be true in general.
{© 2021 The Authors. Mathematische Nachrichten published by Wiley-VCH GmbH}

MSC:

58J50 Spectral problems; spectral geometry; scattering theory on manifolds
35P20 Asymptotic distributions of eigenvalues in context of PDEs

References:

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