Some implications of the leptonic annihilation of dark matter: possible galactic radio emission signatures and the excess radio flux of extragalactic origin

Author(s)

Fortes, Elaine C. F. S. ; Miranda, Oswaldo D. ; Stecker, Floyd W. ; Wuensche, Carlos A.

• Document type: Journal article
• Source: Journal of Cosmology and Astroparticle Physics; v. N/A, n. 11, p. 18-pg., 2019-11-01.

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 MHz to 5 GHz, this channel can produce a stronger signature than direct annihilation into leptons. (AU)

• FAPESP's process: 18/21532-4 - Study of radio waves signals of dark matter by Gravitating systems
• Grantee: Oswaldo Duarte Miranda
• Support Opportunities: Research Grants - Visiting Researcher Grant - Brazil