Dark matter, shared asymmetries, and galactic gamma ray signals

Journal Article · Mon Feb 01 00:00:00 EST 2016 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2016/02/052· OSTI ID:22524977

Fonseca, Nayara ^[1]; Necib, Lina; Thaler, Jesse ^[2]

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1. Instituto de Física, Universidade de São Paulo, São Paulo, SP 05508-900 (Brazil)
2. Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, MA 02139 (United States)

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.

• OSTI ID: 22524977
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 02; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANNIHILATION
ASYMMETRY
BARYON NUMBER
BARYONS
DETECTION
GALAXIES
GALAXY NUCLEI
GAMMA RADIATION
GEV RANGE
NONLUMINOUS MATTER
SPACE
STANDARD MODEL
WIMPS