Dynamical traction from rotating stellar backgrounds can push black holes outward rather than letting them sink, and in cold fragmented discs a two-stage instability may even eject them from the center.
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Dynamical traction and black hole orbital migration
Dynamical traction from rotating stellar backgrounds can push black holes outward rather than letting them sink, and in cold fragmented discs a two-stage instability may even eject them from the center.