Dark matter, shared asymmetries, and galactic gamma ray signals
Author(s)
Fonseca, Nayara
Necib, Lina
Thaler, Jesse
Date Issued
February 2016
Journal
Journal of Cosmology and Astroparticle Physics
Publisher
Institute of Physics Publishing/SISSA
Citation
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.
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1088/1475-7516/2016/02/052
