Revisiting the constraints on primordial black hole abundance with the isotropic gamma ray background

Siyu Chen, Hong-Hao Zhang, Guangbo Long

We revisit the constraints on primordial black holes (PBHs) in the mass range $10^{13}-10^{18}$ g by comparing the 100\,keV-5\,GeV gamma-ray background with isotropic flux from PBH…