Prospects for indirect detection of frozen-in dark matter

Understand

We study observational consequences arising from dark matter (DM) of non-thermal origin, produced by dark freeze-out from a hidden sector heat bath.

• We assume this heat bath was populated by feebly-coupled mediator particles, produced via a Higgs portal interaction with the Standard Model (SM).
• The dark sector then attained internal equilibrium with a characteristic temperature different from the SM photon temperature.
• We find that even if the coupling between the DM and the SM sectors is very weak, the scenario allows for indirect observational signals.