Numerical study of thin accretion disk images shows that increasing parity-odd scalar hair on Kerr black holes shrinks and distorts the photon ring and shadow, producing multiple disconnected shadows and chaotic lensing features in strong-hair regimes.
Kerr-Newman scalar clouds
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abstract
Massive complex scalar fields can form bound states around Kerr black holes. These bound states -- dubbed scalar clouds -- are generically non-zero and finite on and outside the horizon; they decay exponentially at spatial infinity, have a real frequency and are specified by a set of integer "quantum" numbers (n,l,m). For a specific set of these numbers, the clouds are only possible along a 1-dimensional subset of the 2-dimensional parameter space of Kerr black holes, called an existence line. In this paper we make a thorough investigation of the scalar clouds due to neutral (charged) scalar fields around Kerr(-Newman) black holes. We present the location of the existence lines for a variety of quantum numbers, their spatial representation and compare analytic approximation formulas in the literature with our exact numerical results, exhibiting a sometimes remarkable agreement.
fields
gr-qc 2years
2026 2verdicts
UNVERDICTED 2representative citing papers
A rotating black hole in a Dehnen (1,4,γ) halo has its quasibound frequencies shifted by an effective mass scale set by halo parameters, which also lowers the instability threshold and narrows the superradiant window.
citing papers explorer
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Distorting Kerr Images with Parity-Odd Scalar Hair
Numerical study of thin accretion disk images shows that increasing parity-odd scalar hair on Kerr black holes shrinks and distorts the photon ring and shadow, producing multiple disconnected shadows and chaotic lensing features in strong-hair regimes.
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Tuning A Rotating Black Hole Spectrum with Dark Matter Halo: Quasibound States, Scalar Cloud, Black Hole Bomb and Superradiant Scattering
A rotating black hole in a Dehnen (1,4,γ) halo has its quasibound frequencies shifted by an effective mass scale set by halo parameters, which also lowers the instability threshold and narrows the superradiant window.