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On the growth of massive scalar hair around a Schwarzschild black hole

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arxiv 1904.12783 v2 pith:FBXYASNH submitted 2019-04-29 gr-qc astro-ph.COhep-th

Katy Clough , Pedro G. Ferreira , Macarena Lagos This is my paper · ORCID
classification gr-qcastro-ph.COhep-th
keywords scalarmassblackhairholemassivefeaturesfield
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Through numerical simulations of a minimally coupled massive Klein-Gordon scalar field, we show that it is possible to grow hair on a Schwarzschild black hole if one assumes an initial periodically time-varying but spatially homogeneous scalar background. By "hair", we mean a non-trivial profile in the scalar field. We find that this profile emerges on a timescale related to the mass of the black hole, with features related to the mass of the scalar particle. We undertake simulations with and without backreaction on the metric and see that the essential, qualitative features remain consistent. We also contrast the results from higher mass scalars to the case of a low mass with a large Compton wavelength. The results are particularly relevant for scalar-tensor theories of gravity and dark matter models consisting of a massive scalar, e.g. axions.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Kerr black holes with vector dark matter hair

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    Massive vector dark matter forms a r^{-3/2} density spike around a Kerr black hole and, for co-rotating low-frequency modes, extracts mass and angular momentum through superradiant scattering.

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    Numerical evolutions show positive-curvature SL(2,R) sigma-model scalars create denser clouds and earlier binary mergers, while negative-curvature O(3) scalars spread out and delay mergers.

  3. Black-hole hair from vector dark matter accretion

    gr-qc 2025-06 conditional novelty 6.0 of 10

    A Schwarzschild black hole accreting from a bath of vector dark matter develops a nontrivial Proca field profile, with density amplified by up to 10^7 near the horizon and mass accretion rates reaching tens of solar m...

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