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arXiv · 1405.7759

Cosmic Ray Excesses from Multi-component Dark Matter Decays

Chao-Qiang Geng·Da Huang·Lu-Hsing Tsai
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Abstract

We use multi-component decaying dark matter (DM) scenario to explain the possible cosmic ray excesses in the positron fraction recently confirmed by AMS-02 and the total $e^+ +e^-$ flux observed by Fermi-LAT. In the two-component DM models, we find an interesting variation of the flavor structure along with the cutoff of the heavy DM. For the three-component DM case, we focus on a particular parameter range in which the best fits prefer to open only 2 DM decay channels with a third DM contributing nothing to the electron and positron spectra. We show that all models give the reasonable fits to both the AMS-02 positron fraction and the Fermi-LAT total $e^++e^-$ flux, which are also consistent with the measured diffuse $γ$-ray flux by Fermi-LAT.

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Chao-Qiang Geng, Da Huang, Lu-Hsing Tsai. 2014-05-30. Cosmic Ray Excesses from Multi-component Dark Matter Decays. https://doi.org/10.1142/s0217732314400033

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