We study the phenomenology and detection prospects of a sub-GeV Dirac dark matter candidate with resonantly enhanced annihilations via a dark photon mediator. The model evades cosmological constraints on light thermal particles in the early universe while simultaneously being in reach of current and upcoming terrestrial experiments. We conduct a global analysis of the parameter space, considering bounds from accelerator and direct detection experiments, as well as those arising from Big Bang Nucleosynthesis, the Cosmic Microwave Background and dark matter self-interactions. We also extend our discussion to the case of a dark matter subcomponent. We find that large regions of parameter space remain viable even for the case of a moderate resonant enhancement, and demonstrate the complementarity of different experimental strategies for further exploring this scenario.

我们研究了通过暗光子介质共振增强湮灭的亚 GeV Dirac 暗物质候选者的现象学和探测前景。该模型避开了早期宇宙中光热粒子的宇宙学限制，同时适用于当前和即将进行的地球实验。我们对参数空间进行全局分析，考虑来自加速器和直接检测实验的界限，以及由大爆炸核合成、宇宙微波背景和暗物质自相互作用产生的界限。我们还将讨论扩展到暗物质子成分的情况。我们发现即使在中等共振增强的情况下，参数空间的大区域仍然可行，