Near future MeV telescopes can discover asteroid-mass primordial black hole dark matter
arXiv:2102.06714 · doi:10.1103/PhysRevD.104.023516
Abstract
Primordial black holes (PBHs), formed out of large overdensities in the early Universe, are a viable dark matter (DM) candidate over a broad range of masses. Ultra-light, asteroid-mass PBHs with masses around g are particularly interesting as current observations allow them to constitute the entire DM density. PBHs in this mass range emit MeV photons via Hawking radiation which can directly be detected by the gamma ray telescopes, such as the upcoming AMEGO. In this work we forecast how well an instrument with the sensitivity of AMEGO will be able to detect, or rule out, PBHs as a DM candidate, by searching for their evaporating signature when marginalizing over the Galactic and extra-Galactic gamma-ray backgrounds. We find that an instrument with the sensitivity of AMEGO could exclude non-rotating PBHs as the only DM component for masses up to g at 95% confidence level (C.L.) for a monochromatic mass distribution, improving upon current bounds by nearly an order of magnitude. The forecasted constraints are more stringent for PBHs that have rotation, or which follow extended mass distributions.
arXiv commentv2: 10 pages, 5 figures. Results Unchanged. Matches version published in Physical Review D
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