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Scalar hairy black holes in four dimensions are unstable

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If you have a question about this talk, please contact Michalis Agathos .

We present a numerical analysis of the stability properties of the black holes with scalar hair constructed by Herdeiro and Radu. We prove the existence of a novel gauge where the scalar field perturbations decouple from the metric perturbations, and analyse the resulting quasinormal mode spectrum. We find unstable modes with characteristic growth rates which for uniformly small hair are almost identical to those of a massive scalar field on a fixed Kerr background.

This talk is part of the DAMTP Friday GR Seminar series.

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