# Spectroscopy of extremal and near-extremal Kerr black holes

@article{Casals2019SpectroscopyOE, title={Spectroscopy of extremal and near-extremal Kerr black holes}, author={M. Casals and L. F. L. Micchi}, journal={Physical Review D}, year={2019}, volume={99} }

We investigate linear, spin-field perturbations of Kerr black holes in the extremal limit throughout the complex-frequency domain. We calculate quasi-normal modes of extremal Kerr, as well as of near-extremal Kerr, via a novel approach: using the method of Mano, Suzuki and Takasugi (MST). We also show how, in the extremal limit, a branch cut is formed at the superradiant-bound frequency, $\omega_{SR}$, via a simultaneous accumulation of quasi-normal modes and totally-reflected modes. For real… CONTINUE READING

4 Citations

Perturbations of Extremal Kerr Spacetime: Analytic Framework and Late-time Tails

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Perturbations of Extremal Kerr Spacetime: Analytic Framework and Late-time Tails

- Physics, Mathematics
- 2018

5

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