At the same time it is assumed that the dark matter structure of the galaxy halo is mainly based on small black holes formed by Neutron star mergers, because they seems to serve as a frequent and real phenomenon.
Reason to search for so called gravitational micro lensing events in the MW halo also called MACHOs.
see : https://www.researchgate.net/publication/320466725_KiloNova_Merger_Black_Holes_as_the_Origin_of_Ejected_Quasar-based_Dark_Matter_Black_Hole_Halo_population
so: My proposal is that black holes are knotty strings and the same as dark matter but they come up with different sizes even down to ball lightning as interference string knots.
So if lots of neutron stars can merge into small black holes and eject into the galaxy halo, then dark matter could be traced by small lensing events.
see: for Kilonova Dark matter black holes also: https://www.theguardian.com/science/2017/jun/01/third-gravitational-wave-detection-gives-hints-on-dark-matter-and-black-holes?CMP=share_btn_fb
It is also proposed that the recent LIGO VIRGO Neutron star merger could have led to a new family of small black holes, smaller than supernova black holes.:
Last june , the Guardian wrote about small black holes in combination with Dark Matter:
called: "Third gravitational wave detection gives hints on dark matter and black holes."
The Guardian wrote under: "Black holes and dark matter"
"Intriguingly, the observations are consistent with one of the more exotic explanations for the nature of dark matter – that dark matter haloes observed around galaxies are made up of a smattering of small black holes"
"I actually find lots of pieces very likely. You know, the black hole creation isn't impossible because the chaotic collision of the pieces after the breakup of the neutron stars could resemble high-energy collisions."
So it seems an interesting challenge to do research focussed on such smattered small Neutronstar black holes in galaxy halos as a base for dark matter effects and even for the origin of "tired light" effects around such small darkmatter halo black holes.
The Magic of the New Electric Dark Matter Black Hole on Earth and Space
Splitting Dark Matter Black Hole Big Bang as the Origin of Ultra-Energetic-Cosmic-Rays-From Far-Away.