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arXiv · 1806.04745

Sub-GeV Dark Matter Shining at Future MeV Gamma-Ray Telescopes

Francesco D'Eramo·Stefano Profumo
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Abstract

We propose a novel framework where light (sub-GeV) dark matter (DM) is detectable with future MeV gamma-ray telescopes without conflicting with Cosmic Microwave Background (CMB) data. The stable DM particle $\chi$ has a very low thermal relic abundance due to its large pair-annihilation cross section. The DM number density is stored in a heavier, meta-stable partner $\psi$ with suppressed pair-annihilation rates, that does not perturb the CMB, and whose late-time decays $\psi \rightarrow \chi$ fill the universe with $\chi$ DM particles. We provide explicit, model-independent realizations for this framework, and discuss constraints on late-time decays, and thus on parameters of this setup, from CMB, Big Bang Nucleosynthesis, and Large Scale Structure.

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Francesco D'Eramo, Stefano Profumo. 2018-06-12. Sub-GeV Dark Matter Shining at Future MeV Gamma-Ray Telescopes. https://doi.org/10.1103/physrevlett.121.071101

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