No LIGO MACHO: bounds on primordial black holes as dark matter from gravitational lensing of supernovae
Miguel Zumalacarregui
Berkeley Center for Cosmological Physics and IPhT
Tue, Nov. 05th 2019, 16:00-17:00
Salle Claude Itzykson, Bât. 774, Orme des Merisiers

Black hole mergers detected by the Laser Interferometer Gravitational-Wave Observatory (LIGO) have revived dark matter models based on primordial black holes (PBH) or other massive compact halo objects (MACHO). These objects would be abundant in the mass range $1-100 M_{Sun}$, where rather remarkably, previous bounds were the weakest. I will present constraints on the PBH abundance and mass using the gravitational lensing magnification of type Ia supernovae using current data. Our results rule out the hypothesis of MACHO/PBH comprising the totality of the dark matter at high significance in the mass range $M > 0.01 M_{Sun}$. Eliminating the possibility of a LIGO-mass MACHO constraints early-universe models that produce PBHs and further strengthens the case for lighter dark matter candidates.

Contact : Filippo VERNIZZI


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