Subsonic accretion and dynamical friction for a black hole moving through a self-interacting scalar dark matter cloud

Abstract

We investigate the flow around a black hole moving through a cloud of self-interacting scalar dark matter. We focus on the large scalar mass limit, with quartic self-interactions, and on the subsonic regime. We show how the scalar field behaves as a perfect gas of adiabatic index ${\gamma }_{\mathrm{ad}}=2$ at large radii while the accretion rate is governed by the relativistic regime close to the Schwarzschild radius. We obtain analytical results thanks to large-radius expansions, which are also related to the small-scale relativistic accretion rate. We find that the accretion rate is greater than for collisionless particles, by a factor $c/c_s\gg 1$, but smaller than for a perfect gas, by a factor $c_s/c\ll 1$, where $c_s$ is the speed of sound. The dynamical friction is smaller than for a perfect gas, by the same factor $c_s/c\ll 1$, and also smaller than Chandrasekhar's result for collisionless particles, by a factor $c_s/(cC)$, where $C$ is the Coulomb logarithm. It is also smaller than for fuzzy dark matter, by a factor $v_0/c\ll 1$.

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• Dynamical friction in ultralight dark matter: Plummer sphere perspective
• Gravitational Wave Duet by Resonating Binary Black Holes within Ultralight Dark Matter