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Pré-Publication, Document De Travail Année : 2019

New eigenvalue estimates involving Bessel functions

Résumé

Given a compact Riemannian manifold (M n , g) with boundary ∂M , we give an estimate for the quotient ∂M f dµ g M f dµ g , where f is a smooth positive function defined on M that satisfies some inequality involving the scalar Laplacian. By the mean value lemma established in [37], we provide a differential inequality for f which, under some curvature assumptions, can be interpreted in terms of Bessel functions. As an application of our main result, a direct proof is given of the Faber-Krahn inequalities for Dirichlet and Robin Laplacian. Also, a new estimate is established for the eigenvalues of the Dirac operator that involves a positive root of Bessel function besides the scalar curvature. Independently, we extend the Robin Laplacian on functions to differential forms. We prove that this natural extension defines a self-adjoint and elliptic operator whose spectrum is discrete and consists of positive real eigenvalues. In particular, we characterize its first eigenvalue and provide a lower bound of it in terms of Bessel functions.
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Dates et versions

hal-02264339 , version 1 (06-08-2019)
hal-02264339 , version 2 (12-09-2019)

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Fida El Chami, Nicolas Ginoux, Georges Habib. New eigenvalue estimates involving Bessel functions. 2019. ⟨hal-02264339v1⟩
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