Speaker
Hyun Min Lee
(CAU)
Description
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 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 classify
multiple dark matter components with spins and parities, showing a u-channel pole
in the co-scattering processes. We introduce dark photon and dark Higgs portals
and microscopic models for realistic self-resonant dark matter and discuss various
observational consequences.
