Speaker
Dr
Sergey Sibiryakov
(McMaster U. & Perimeter Inst.)
Description
We revisit the mechanism for production of primordial black holes (PBHs) via collapse of domain walls nucleated during inflation. We highlight the importance of the intrinsic domain wall asymmetry that precludes formation of light black holes — an effect overlooked in the previous studies. As a result, the mass spectrum of PBHs produced by this mechanism gets cut at the low PBH mass end, making it compatible with the existing constraints. A spectrum peaked in the asteroid mass window can account for all of dark matter and possesses a model-independent power-law tail extending towards higher masses. It will be probed by the upcoming Roman microlensing survey.
Author
Dr
Sergey Sibiryakov
(McMaster U. & Perimeter Inst.)