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arXiv · 1907.13184

Some Implications of the Leptonic Annihilation of Dark Matter: Possible Galactic Radio Emission Signatures and the Excess Radio Flux of Extragalactic Origin

Elaine C. F. S. Fortes·Oswaldo D. Miranda·Floyd W. Stecker·Carlos A. Wuensche
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Abstract

We give theoretical predictions for the radio emission of a dark matter candidate annihilating into 2-lepton and 4-lepton final states. We then compare our results with the known radio measurements of the sky temperature as a function of the frequency. In particular, we calculate the radio emission for some dark matter candidates annihilating into intermediate bosons that subsequently decay into a 4-lepton channel with a thermal annihilation cross-section. We show that within the range of frequencies from $20\,{\rm MHz}$ to $5\,{\rm GHz}$, this channel can produce a stronger signature than direct annihilation into leptons.

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Elaine C. F. S. Fortes, Oswaldo D. Miranda, Floyd W. Stecker, Carlos A. Wuensche. 2019-11-28. Some Implications of the Leptonic Annihilation of Dark Matter: Possible Galactic Radio Emission Signatures and the Excess Radio Flux of Extragalactic Origin. https://doi.org/10.1088/1475-7516%2F2019%2F11%2F047

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