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Assisted annihilation generates thermal sub-GeV dark matter through a novelannihilation between a pair of dark matter and standard-model-like states,called the "assister". We show that, depending on the mass hierarchy betweenthe assister and dark matter, there can be either a suppression or a boost ofthe effective cross section. This augmentation enables the possibility of$\mathcal{O}(100)$ MeV scale dark matter with perturbative coupling thatsaturates the relic density estimates while being relatively insulated fromcosmological constraints like big bang nucleosynthesis and cosmic microwavebackground.

Boosting Assisted Annihilation for a Cosmologically Safe MeV Scale Dark Matter