Dark matter, shared asymmetries, and galactic gamma ray signals
Author(s)Fonseca, Nayara; Necib, Lina; Thaler, Jesse
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We introduce a novel dark matter scenario where the visible sector and the dark sector share a common asymmetry. The two sectors are connected through an unstable mediator with baryon number one, allowing the standard model baryon asymmetry to be shared with dark matter via semi-annihilation. The present-day abundance of dark matter is then set by thermal freeze-out of this semi-annihilation process, yielding an asymmetric version of the WIMP miracle as well as promising signals for indirect detection experiments. As a proof of concept, we find a viable region of parameter space consistent with the observed Fermi excess of GeV gamma rays from the galactic center.
DepartmentMassachusetts Institute of Technology. Center for Theoretical Physics; Massachusetts Institute of Technology. Department of Physics
Journal of Cosmology and Astroparticle Physics
Institute of Physics Publishing/SISSA
Fonseca, Nayara, Lina Necib, and Jesse Thaler. “Dark Matter, Shared Asymmetries, and Galactic Gamma Ray Signals.” Journal of Cosmology and Astroparticle Physics 2016, no. 02 (February 22, 2016): 052–052.
Final published version