Resonance enhancement of dark matter interactions: the case for early kinetic decoupling and velocity dependent resonance width

Mateusz Duch, Bohdan Grzadkowski

Motivated by the possibility of enhancing dark matter (DM) self-interaction cross-section ${\sigma }_{\mathrm{self}}$, we have revisited the issue of DM annihilation through a Breit-Wigner reso…