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Using a recently developed perturbation theory for uasinormal modes (QNM's),we evaluate the shifts in the real and imaginary parts of the QNM frequenciesdue to a quasi-static perturbation of the black hole spacetime. We show theperturbed QNM spectrum of a black hole can have interesting features using asimple model based on the scalar wave equation.Comment: Published in PR

Perturbative approach to the quasinormal modes of dirty black holes