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(H)airborne: two spinning black holes balanced by their synchronised scalar hair

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arxiv 2305.15467 v1 pith:GZDZ6C6P submitted 2023-05-24 gr-qc astro-ph.HEhep-th

Carlos A. R. Herdeiro , Eugen Radu This is my paper · ORCID
classification gr-qcastro-ph.HEhep-th
keywords sbhsequilibriumscalarsolutionsspinningairborneangularblack
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General Relativity minimally coupled to a massive, free, complex scalar field, is shown to allow asymptotically flat solutions, non-singular on and outside the event horizon, describing two spinning black holes (2sBHs) in equilibrium, with co-axial, aligned angular momenta. The 2sBHs configurations bifurcate from solutions describing dipolar spinning boson stars. The BHs emerge at equilibrium points diagnosed by a test particle analysis and illustrated by a Newtonian analogue. The individual BH "charges" are mass and angular momentum only. Equilibrium is due to the scalar environment, acting as a (compact) dipolar field, providing a lift against their mutual attraction, making the 2sBHs (h)airborne. We explore the 2sBHs domain of solutions and its main features.

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  1. Spinning generalizations of Majumdar-Papapetrou multi-black hole spacetimes: light rings, lensing and shadows

    gr-qc 2025-02 conditional novelty 6.0 of 10

    For the Teo-Wan two-black-hole spacetime, light rings merge and annihilate in pairs, giving total counts of 4, 6, or 8, and the shadows mimic double-Kerr.

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