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arXiv · 1206.7056

Decaying vs Annihilating Dark Matter in Light of a Tentative Gamma-Ray Line

Wilfried Buchmuller·Mathias Garny
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Abstract

Recently reported tentative evidence for a gamma-ray line in the Fermi-LAT data is of great potential interest for identifying the nature of dark matter. We compare the implications for decaying and annihilating dark matter taking the constraints from continuum gamma-rays, antiproton flux and morphology of the excess into account. We find that higgsino and wino dark matter are excluded, also for nonthermal production. Generically, the continuum gamma-ray flux severely constrains annihilating dark matter. Consistency of decaying dark matter with the spatial distribution of the Fermi-LAT excess would require an enhancement of the dark matter density near the Galactic center.

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Wilfried Buchmuller, Mathias Garny. 2014-01-14. Decaying vs Annihilating Dark Matter in Light of a Tentative Gamma-Ray Line. https://doi.org/10.1088/1475-7516%2F2012%2F08%2F035

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