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Snowmass2021 Cosmic Frontier White Paper: Puzzling Excesses in Dark Matter Searches and How to Resolve Them
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Intriguing signals with excesses over expected backgrounds have been observed in many astrophysical and terrestrial settings, which could potentially have a dark matter origin. Astrophysical excesses include the Galactic Center GeV gamma-ray excess detected by the Fermi Gamma-Ray Space Telescope, the AMS antiproton and positron excesses, and the 511 and 3.5 keV X-ray lines. Direct detection excesses include the DAMA/LIBRA annual modulation signal, the XENON1T excess, and low-threshold excesses in solid state detectors. We discuss avenues to resolve these excesses, with actions the field can take over the next several years.
Forward citations
Cited by 2 Pith papers
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Conversions in two-component dark sectors: a phase space level analysis
In the double Coy dark matter model, full phase-space Boltzmann evolution with conversions changes relic abundances by up to an order of magnitude per component and by more than 100% for the total in some parameter regions.
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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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