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2023

Dynamical friction in self-interacting ultralight dark matter

Glennon, Noah, Musoke, Nathan, Nadler, Ethan O. et al.

Understand

We explore how dynamical friction in an ultralight dark matter (ULDM) background is affected by dark matter self-interactions.

We calculate the force of dynamical friction on a point mass moving through a uniform ULDM background with self-interactions, finding that the force of dynamical friction vanishes for sufficiently strong repulsive self-interactions.
Using the pseudospectral solver $\texttt{UltraDark.jl}$, we show with simulations that reasonable values of the ULDM self-interaction strength and particle mass cause $\mathcal{O}(1)$ differences in the acceleration of an object like a supermassive black hole (SMBH) traveling near the center of a soliton, relative to the case with no self-interactions.
For example, repulsive self-interactions with $\lambda = 10^{-90}$ yield a deceleration due to dynamical friction $\approx70\%$ smaller than a model with no self-interactions.