Hunting for Dark Matter and New Physics with GECCO

Abstract

We outline the science opportunities in the areas of searches for dark matter and new physics offered by a proposed future MeV gamma-ray telescope, the Galactic Explorer with a Coded Aperture Mask Compton Telescope (GECCO). We point out that such an instrument would play a critical role in opening up a discovery window for particle dark matter with mass in the MeV or sub-MeV range, in disentangling the origin of the mysterious 511 keV line emission in the Galactic Center region, and in potentially discovering Hawking evaporation from light primordial black holes.

arXiv comment27 pages, 10 figures, ~matches published version

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• How open is the asteroid-mass primordial black hole window?
• Constraints on dark matter with future MeV gamma-ray telescopes
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• Constraining light dark matter in vector-scalar portals with COSI and AMEGO-X