Abstract:
The dominant quasinormal frequency is determined by the scattering of perturbations around the peak of the effective potential, being therefore a characteristic of the geometry of the radiation zone. At the same time the overtones of the gravitational-wave signal can be sensitive to the near-horizon geometry and, therefore, their detection can probe the geometry of the event horizon. I shall discuss the quasinormal ringing of the black holes, which differ from the Schwarzschild solution only near the event horizon, and a parametric approach to the near-horizon deformations of the Schwarzschild black holes.

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