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Moving black holes: energy extraction, absorption cross-section and the ring of fire

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arxiv 1906.10140 v2 pith:2ZRAHSLD submitted 2019-06-24 gr-qc astro-ph.HEhep-thphysics.optics

classification gr-qcastro-ph.HEhep-thphysics.optics
keywords blackholeenergymovingabsorptioncross-sectionholesradiation
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We consider the interaction between a plane wave and a (counter-moving) black hole. We show that energy is transferred from the black hole to the wave, giving rise to a negative absorption cross-section. Moving black holes absorb radiation and deposit energy in external radiation. Due to this effect, a black hole hole of mass M moving at relativistic speeds in a cold medium will appear to be surrounded by a bright "ring" of diameter 3\sqrt{3}GM/c^2 and thickness GM/c^2.

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Cited by 1 Pith paper

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  1. Ringdown and lensing of triple systems

    gr-qc 2026-05 unverdicted novelty 6.0 of 10

    Numerical relativity simulations of triple black hole systems reveal redshift effects and gravitational lensing in ringdown signals from head-on mergers, with no additional black hole formation from amplified waves.

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