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MeV Dark Matter: Has It Been Detected?
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We discuss the possibility that the recent detection of 511 keV gamma-rays from the galactic bulge, as observed by INTEGRAL, is a consequence of low mass (~MeV) particle dark matter annihilations. We discuss the type of halo profile favored by the observations as well as the size of the annihilation cross section needed to account for the signal. We find that such a scenario is consistent with the observed dark matter relic density and other constraints from astrophysics and particle physics.
Forward citations
Cited by 3 Pith papers
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Dark Matter Interpretation of the Super-Kamiokande Antineutrino Excess and Predictions for JUNO
Interprets Super-Kamiokande antineutrino excess as s-wave annihilating dark matter with mass in the tens of MeV, predicting signals for JUNO.
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Dark Photon - ALP Freeze-in: 511 keV and H$\alpha$ Constraints
A nearly degenerate ALP–dark-photon freeze-in model can reproduce the relic density and the 511 keV line while passing Hα and other constraints only in a narrow window with Λ≈10^10–10^12 GeV and ϵ≈10^-24–10^-23.
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Novel Signals from Neutron Star Mergers at 511 keV
Neutron star merger ejecta can emit enough positrons to explain the Galactic Center 511 keV line, linking r-process nucleosynthesis to gamma-ray observations.
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