Models for self-resonant dark matter

Models for self-resonant dark matter

Blog Article

Abstract We consider a new mechanism for enhancing the self-scattering and annihilation cross sections for dark matter with multiple components but without a light mediator.The lighter dark matter component plays a role of the u-channel pole in the elastic co-scattering for dark matter, leading to here a large self-scattering cross section and a Sommerfeld enhancement for semi-annihilation processes.Taking the effective theory approach for self-resonant dark matter, we present various combinations of multiple dark matter components with grandpas best spins and parities, showing a u-channel pole in the co-scattering processes.Adopting dark photon and dark Higgs portals for self-resonant dark matter, we impose the relic density condition as well as indirect detection bounds on semi-annihilation channels with a Sommerfeld enhancement and discuss potential signals for direct detection experiments.