A perturbative calculation shows that a secondary body in Kerr spacetime creates a wake in a superradiant scalar cloud, with energy fluxes that differ from Schwarzschild predictions by tens of percent.
Relativistic dynamical friction in a collisional fluid
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abstract
The dynamical friction force experienced by a body moving at relativistic speed in a gaseous medium is examined. This force, which arises due to the gravitational interaction of the body with its own gravitationally-induced wake, is calculated for straight-line and circular motion, generalizing previous results by several authors. Possible applications to the study of extreme mass-ratio inspirals around strongly-accreting supermassive black holes are suggested.
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Environmental effects in extreme mass ratio inspirals: perturbations to the environment in Kerr
A perturbative calculation shows that a secondary body in Kerr spacetime creates a wake in a superradiant scalar cloud, with energy fluxes that differ from Schwarzschild predictions by tens of percent.