Astroparticle Physics Seminar

Self-interacting dark matter with a stable scalar mediator

by Dr Mateusz Duch (TUM)

Europe/Berlin
Main/2-313 - 313 (Main)

Main/2-313 - 313

Main

30
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Description

Self-interacting DM is a popular remedy to the small-scale structure problems of the collisionless cold DM paradigm. Sufficiently strong DM self-interactions can be generated nonperturbatively by a light MeV-scale mediator. However, its decays into SM particles are related to the strong constraints from DM direct and indirect detection experiments. In this talk, I will present an alternative scenario with the dominant fermionic DM component and the stable scalar mediator. In this model, the relic abundance of self-interacting fermion may still be obtained from the freeze-out of its annihilations into the stable scalar, but since this channel is invisible, the DM indirect detection constraints are greatly relaxed. Furthermore, the direct detection signals are suppressed to an unobservable level because fermionic DM scatterings with a nucleon appear at the one-loop level. Finally, the viability of this scenario is confirmed by the careful analysis of BBN and CMB bounds on the presence of light states in the hidden sector.