Boomerang mechanism explaining the excess radio background
Abstract
We propose a for the explanation of the excess radio background detected by ARCADE 2. In an early stage of the Universe, at a temperature T in the range ∼ 0.1 keV − 1 MeV , a fraction of relic neutrinos is resonantly converted into dark neutrinos by mixing induced by a preexisting lepton asymmetry. Dark neutrinos decay much later into a dark-standard photon state and a dark fermion, with a lifetime longer than the age of the Universe, as required by a solution to the excess radio background. This scenario circumvents the upper bound on the neutrino magnetic moment but still implies a testable lower bound.
Fields of Study & Subjects
Dark Matter and Cosmic Phenomena
Cosmology and Gravitation Theories
Astrophysics and Cosmic Phenomena
Publication details
- Journal / source
- Physical review. D/Physical review. D.
- Volume
- 113
- Issue
- 12
- Publication date
- 21 April 2026
- Language
- EN