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Updated Constraints on Primordial Black Hole Evaporation

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arxiv 2302.04408 v3 pith:QH2TA5SS submitted 2023-02-09 hep-ph astro-ph.CO

Mrunal Korwar , Stefano Profumo This is my paper · ORCID
classification hep-phastro-ph.CO
keywords gamma-rayconstraintsblackevaporationsoftholeisotropicobservations
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The Hawking evaporation process, leading to the production of detectable particle species, constrains the abundance of light black holes, presumably of primordial origin. Here, we reconsider and correct constraints from soft gamma-ray observations, including of the gamma-ray line, at 511 keV, produced by electron-positron pair-annihilation, where positrons originate from black hole evaporation. First, we point out that the INTEGRAL detection of the Large Magellanic Cloud provides one of the strongest bounds attainable with present observations; and that future MeV gamma-ray telescopes, such as GECCO, will greatly enhance such constraints. Second, we discuss issues with previous limits from the isotropic flux at 511 keV and we provide updated, robust constraints from recent measurements of the diffuse Galactic soft gamma-ray emission and from the isotropic soft gamma-ray background.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Revisiting PBH accretion, evaporation and their cosmological consequences

    astro-ph.HE 2025-12 conditional novelty 6.0 of 10

    Relativistic accretion onto Kerr primordial black holes gives roughly 4.5x mass growth and fast spin-down, strengthening BBN bounds, lowering the survival mass to ~2.7e14 g, and erasing the high-frequency stochastic g...

  2. Stochastic Evolution of Primordial Black Holes to near-extremality in EFTs of Gravity

    gr-qc 2026-02 conditional novelty 5.0 of 10

    In EFT-modified gravity, about the same fraction of primordial black holes (24.6–24.9%) spin up to near-extremality as in GR (~24.7%), and those survivors carry ~10x enhanced near-horizon tidal forces.

  3. Picolensing as a Probe of Primordial Black Hole Dark Matter

    astro-ph.HE 2024-11 conditional novelty 5.0 of 10

    Asteroid-mass primordial black hole dark matter could be probed by picolensing of gamma-ray bursts, but only with detector separations of at least Earth-L2 distance once realistic GRB size uncertainties are included.

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