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The 511 keV Excess and Primordial Black Holes
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abstract
An excess of 511 keV photons has been detected from the central region of the Milky Way. It has been suggested that the positrons responsible for this signal could be produced through the Hawking evaporation of primordial black holes. After evaluating the constraints from INTEGRAL, COMPTEL, and Voyager 1, we find that black holes in mass range of $\sim(1-4)\times10^{16}$ g could potentially produce this signal if they make up a small fraction of the total dark matter density. Proposed MeV-scale gamma-ray telescopes such as AMEGO or e-ASTROGAM should be able to test this class of scenarios by measuring the diffuse gamma ray emission from the Milky Way's inner halo.
Forward citations
Cited by 1 Pith paper
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Relaxation of Energy Constraints for Positrons Generating the Galactic Annihilation Signal
A full forward model of INTEGRAL, COMPTEL, and EGRET data relaxes the upper limit on positron injection energy for the Galactic 511 keV signal from a few MeV to roughly 40-60 MeV.
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