Bas du spectre de surfaces hyperboliques de volume infini

Details Bas du spectre de surfaces hyperboliques de volume infini Bas du spectre de surfaces hyperboliques de volume infini

2008-07-25

arxiv.org/abs/0807.4068v1

Mathematics

Differential Geometry

Scientific paper

This article presents some methods to control the bottom of the spectrum of the Laplacian $\lambda_0$ on hyperbolic surfaces with infinite volume. Our first result bounds the $\lambda_0$ of a geometrically finite surface in terms of the geometry of its convex core. We then focus on infinite type periodic hyperbolic surfaces built by gluing copies of a geometrically finite surface with boundary according to the plan of an infinite graph. We control the $\lambda_0$ of the so-obtained infinite surfaces by constants coming from spectral properties of the building brick and combinatorial datae of the graph. We then use these methods to control the $\lambda_0$ of two other kind of infinite type hyperbolic surfaces : those admitting a splitting into bounded pieces, and some riemannian coverings.

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