Minimal mass of thermal dark matter and the viability of millicharged particles affecting 21-cm cosmology
Minimal mass of thermal dark matter and the viability of millicharged particles affecting 21-cm cosmology
Thermal freeze-out offers an attractive explanation of the dark matter density free from fine-tuning of initial conditions. For dark matter with a mass below tens of MeV, photons, electrons, and neutrinos are the only available direct Standard Model annihilation products. Using a full three-sector abundance calculation, we determine the minimal …