Probing multicomponent FIMP scenarios with gamma-ray telescopes

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 ${\psi }_2\to {\psi }_1\gamma$ for fermionic FIMPs, or ${\varphi }_2\to {\varphi }_1\gamma \gamma$ for scalar FIMPs, could have detectable rates for model parameters compatible with the observed dark matter abundance.

arXiv comment14 pages, 3 figures

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• Scalar and Fermion Two-component SIMP Dark Matter with an Accidental ${\mathbb{Z}}_4^{}$ Symmetry
• Freezing In with Lepton Flavored Fermions
• Reshuffled Strongly Interacting Massive Particle Dark Matter
• Production and signatures of multi-flavour dark matter scenarios with t-channel mediators