Collisions of Neutron Stars with Primordial Black Holes as Fast Radio Bursts Engines

If primordial black holes (PBH) with masses of constitute a non-negligible fraction of galactic dark-matter halos, their existence should have observable consequences: they necessarily collide with galactic neutron stars (NS), nest in their centers, and accrete the dense matter, eventually convertin...

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Bibliographic Details
Published in:The Astrophysical journal 2018-11, Vol.868 (1), p.17
Main Authors: Abramowicz, Marek A., Bejger, Micha, Wielgus, Maciek
Format: Article
Language:English
Subjects:
Accretion
Astronomy & Astrophysics
Astrophysics
black hole physics
Black holes
Brightness temperature
dark matter
Deposition
Faraday effect
Fysik
Galactic halos
Galaxies
Halos
Magnetic fields
matter
Neutron stars
Neutrons
Phenomenology
Physical Sciences
Radio bursts
stars: neutron
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Summary:If primordial black holes (PBH) with masses of constitute a non-negligible fraction of galactic dark-matter halos, their existence should have observable consequences: they necessarily collide with galactic neutron stars (NS), nest in their centers, and accrete the dense matter, eventually converting them to NS-mass black holes while releasing the NS magnetic field energy. Such processes may explain the fast radio bursts (FRB) phenomenology, in particular their millisecond durations, large luminosities ∼1043 erg s−1, high rate of occurrence , as well as high brightness temperatures, polarized emission, and Faraday rotation. Longer than the dynamical timescale of the Bondi-like accretion for light PBH allows for the repeating of FRB. This explanation follows naturally from the (assumed) existence of the dark-matter PBH and requires no additional unusual phenomena, in particular no unacceptably large magnetic fields of NS. In our model, the observed rate of FRB throughout the universe follows from the presently known number of NS in the Galaxy.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/aae64a