Supermassive dark-matter Q-balls in galactic centers?

Abstract

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.

15 pages (jcappub.sty), 3 figures. V2: clarifications and references added, version accepted by JCAP

References in corpus (21)

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• An ultra-luminous quasar with a twelve-billion-solar-mass black hole at redshift 6.30
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• Gravitational waves from Affleck-Dine condensate fragmentation
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• No asymmetric outflows from Sagittarius A* during the pericenter passage of the gas cloud G2
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Cited by in corpus (15)

• Boson Stars and Oscillatons: A Review
• Review of non-topological solitons in theories with $U(1)$-symmetry
• Gravitational waves and kicks from the merger of unequal mass, highly compact boson stars
• ${}^{222}$Rn emanation measurements for the XENON1T experiment
• Propagation of self-localised Q-ball solitons in the ${}^3$He universe
• The fate of small classically stable Q-balls
• Non-topological solitons and quasi-solitons
• Magnon Bose-Einstein condensates: from time crystals and quantum chromodynamics to vortex sensing and cosmology
• Quasi-Compact Q-Balls
• Weyl-Invariant Gravity and the Nature of Dark Matter
• Hydrodynamic and Rayleigh-Plateau instabilities of Q-strings
• The Resurgence of the G(2) Group for the Strong Sector and the Emergence of Dark Matter
• Can dark-matter Q-balls grow to the mass gap masses?
• Soliton boson stars, Q-balls and the causal Buchdahl bound
• Understanding the Quantized Angular Momentum of Rotating Q-balls