Collisions of dark matter Galactic halo primordial black holes PBH with Galactic neutron stars NS.

by Marek A. Abramowicz

Wednesday 8 Mar 2023, 13:30 → 14:30 Europe/Stockholm

Albano 3: 6228 - Mega (22 seats) (Albano Building 3)

Hybrid talk: Mega (6228, Hus 3, Albano) + https://stockholmuniversity.zoom.us/j/530682073

 

If PBH exist in the Galactic halo they must collide with
NS. The first collision initiates a series of subsequent collisions
in which the PBH loses its kinetic energy through dynamical
friction and settles down at the NS centre. This is the first
"damping" stage of the phenomenon. In the second "Bondi"
stage the PBH slowly accretes the NS material: the mass of the
central black hole grows, and also grows the accretion velocity.
When the accretion velocity is larger than the sound speed in
most of the volume, the third  stage starts: "collapse" (Oppenheimer-
Snyder). This way the light black holes (LBH),
with the mass ~1.4 M_Sun form. LBH may be detected by
LIGO-Virgo-Kagra or microlensing as proxies of PBH.