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Supermassive dark-matter Q-balls in galactic centers?
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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 Milky Way's SMCO can be a giant nontopological soliton, Q-ball, made of a scalar field: this fits perfectly all observational data. Similar but tiny Q-balls produced in the early Universe may constitute, partly or fully, the dark matter. This picture explains in a natural way, why our SMCO has very low accretion rate and why the observed angular size of the corresponding radio source is much smaller than expected. Interactions between dark-matter Q-balls may explain how SMCOs were seeded in galaxies and resolve well-known problems of standard (non-interacting) dark matter.
Forward citations
Cited by 3 Pith papers
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Dynamical flattening of halo density cusps by Q-ball dark matter
Interacting Q-ball dark matter flattens NFW cusps via density-dependent mergers that convert rest mass into escaping relativistic dark-sector particles, preferentially in halo centers.
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Hydrodynamic and Rayleigh-Plateau instabilities of Q-strings
Cylindrical Q-strings are linearly unstable to long-wavelength axial perturbations, with a threshold that matches the Rayleigh-Plateau instability λc=2πR for thin-wall solitons.
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Can dark-matter Q-balls grow to the mass gap masses?
Dark-matter Q-balls in the simplest Friedberg-Lee-Sirlin model can grow to solar masses near galactic centers, but their final radii are about a solar-system wide, so they cannot explain LIGO/Virgo mass-gap events.
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