The purpose of this note is to apply the methods of geometric scattering theory developed by Briet-Combes-Duclos [6], Gerard-Sjöstrand [14], Mazzeo-Melrose [22] and the second author [30] in the simplest model of a Black Hole: the De Sitter-Schwarzschild metric. We show that the resonances (or the quasi normal modes, in
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Barreto et al. (1997) studied this question.
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