Dynamical friction of black holes in ultralight dark matter

Rodrigo Vicente; Vitor Cardoso

Dynamical friction of black holes in ultralight dark matter

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arxiv 2201.08854 v2 pith:VA65BU6M submitted 2022-01-21 gr-qc astro-ph.COhep-th

Rodrigo Vicente , Vitor Cardoso This is my paper

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keywords blackdarkdynamicalfrictionholematterultralightholes

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In this work we derive simple closed-form expressions for the dynamical friction acting on black holes moving through ultralight (scalar field) dark matter, covering both non-relativistic and relativistic black hole speeds. Our derivation is based on long known scattering amplitudes in black hole spacetimes, it includes the effect of black hole spin and can be easily extended to vector and tensor light fields. Our results cover and complement recent numerical and previous non-relativistic treatments of dynamical friction in ultralight dark matter.

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Extreme mass-ratio inspiral within an ultralight scalar cloud I. Scalar radiation
gr-qc 2025-07 conditional novelty 6.0 of 10

Scalar radiation from an EMRI in an ultralight scalar cloud is computed semi-analytically, showing dipole clouds decelerate and quadrupole clouds accelerate the inspiral, with up to about 100 rad dephasing after 18 months.

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