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We discuss the phenomenology of an MeV-scale Dirac fermion coupled to theStandard Model through a dark photon with kinetic mixing with theelectromagnetic field. We compute the dark matter relic density and explore theinterplay of direct detection and accelerator searches for dark photons. Weshow that precise measurements of the temperature and polarization powerspectra of the Cosmic Microwave Background Radiation lead to stringentconstraints, leaving a small window for the thermal production of this MeV darkmatter candidate. The forthcoming MeV gamma-ray telescope e-ASTROGAM will offerimportant and complementary opportunities to discover dark matter particleswith masses below 10 MeV. Lastly, we discuss how a late-time inflation episodeand freeze-in production could conspire to yield the correct relic densitywhile being consistent with existing and future constraints.

MeV Dark Matter Complementarity and the Dark Photon Portal