New X-ray bound on density of primordial black holes

Abstract

We set a new upper limit on the abundance of primordial black holes (PBH) based on existing X-ray data. PBH interactions with interstellar medium should result in significant fluxes of X-ray photons, which would contribute to the observed number density of compact X-ray objects in galaxies. The data constrain PBH number density in the mass range from a few $M_{\odot }$ to $2\times 10^7{M}_{\odot }$. PBH density needed to account for the origin of black holes detected by LIGO is marginally allowed.

arXiv comment12 pages, 2 figures, accepted for publication in JCAP

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