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Abstract:
The theory of superfluid dark matter is based on self-interacting sub-eV bosons which thermalise and condense to form a superfluid core in galaxies. We show that massive black holes at their center change the superfluid density profile and give rise to dark matter spikes, whose slope depends on the bosons self-interactions. These spikes affect the evolution of binary systems by inducing dynamical friction on the orbiting bodies. We discuss the role of dynamical friction for black hole binaries moving within the superfluid and the prospect for its detection at LISA.