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Though widely accepted, it is not proven that supermassive compact objects(SMCOs) residing in galactic centers are black holes. In particular, the MilkyWay's SMCO can be a giant nontopological soliton, Q-ball, made of a scalarfield: this fits perfectly all observational data. Similar but tiny Q-ballsproduced in the early Universe may constitute, partly or fully, the darkmatter. This picture explains in a natural way, why our SMCO has very lowaccretion rate and why the observed angular size of the corresponding radiosource is much smaller than expected. Interactions between dark-matter Q-ballsmay explain how SMCOs were seeded in galaxies and resolve well-known problemsof standard (non-interacting) dark matter.

Supermassive dark-matter Q-balls in galactic centers?