Abstract
We consider a scenario where the dark sector includes two Feebly Interacting Massive Particles (FIMPs), with couplings to the Standard Model particles that allow their production in the Early Universe via thermal freeze-in. These couplings generically lead to the decay of the heavier dark matter component into the lighter, possibly leading to observable signals of the otherwise elusive FIMPs. Concretely, we argue that the loop induced decay ψ2→ψ1γ for fermionic FIMPs, or ϕ2→ϕ1γγ for scalar FIMPs, could have detectable rates for model parameters compatible with the observed dark matter abundance.
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