According to Quantum FFF theory, Dark Matter is based on complex Higgs based Stringy Quantum knots, at larger scale called Black Holes, equipped with Gravity and space curvature (absorbing) effect, but WITH REDUCED INERTIA.
As a consequence; Galaxy cluster mergers (Abell 520) show -until now unexplained- early Dark matter merging in the center of the merging galaxy clusters.
These migrating dark matter black holes however are probably only Super Nova black holes able to search for an equal sized partner to form a HH system and star creation in between..
(according to Q-FFF Theory) see:
The Fermion Repelling String Black Hole, the origin of a Cyclic Raspberry Multiverse. see: http://vixra.org/pdf/1909.0417v1.pdf
see also: The Magic of Life- and Matter Creating Self Propelled Electric Dark Matter Black Holes Guided by a Holographic Entangled Symmetric Multiverse System.
http://vixra.org/pdf/1705.0026v1.pdf