The poster presents work done in 2006.16139 where we study dark matter production mechanism based on decays of a messenger WIMP-like state into a pair of dark matter particles that are self-interacting via exchange of a light mediator. A natural by-product of this mechanism is a possibility of a late time transition to subdominant dark radiation component. We provide a simple realization of the mechanism in a Higgs portal dark matter model where we find a significant region of the parameter space that leads to a mild relaxation of the Hubble tension while simultaneously having the potential of addressing small-scale structure problems of ΛCDM.
|First author||Krzysztof Jodłowski|
|Collaboration / Activity||NCBJ|