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Near future MeV telescopes can discover asteroid-mass primordial black hole dark matter

Ray, A and Laha, R and Muñoz, JB and Caputo, R (2021) Near future MeV telescopes can discover asteroid-mass primordial black hole dark matter. In: Physical Review D, 104 (2).

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Official URL: https://doi.org/10.1103/PhysRevD.104.023516


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. Ultralight, asteroid-mass PBHs with masses around are particularly interesting as current observations allow them to constitute the entire DM density. PBHs in this mass range emit 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 nonrotating PBHs as the only DM component for masses up to at 95 confidence level 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. © 2021 American Physical Society

Item Type: Journal Article
Publication: Physical Review D
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to American Physical Society
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 15 Nov 2021 10:41
Last Modified: 15 Nov 2021 10:41
URI: http://eprints.iisc.ac.in/id/eprint/69660

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