标题： 标量共SIMP暗物质：模型与灵敏度 显示英文标题

标题： Scalar Co-SIMP Dark Matter: Models and Sensitivities

摘要： 在这项工作中，我们提出了最近提出的数变型共SIMP冻结机制的紫外完备化。与完全发生在暗物质领域的标准吞噬型暗物质图像不同，在这种情况下决定遗迹丰度的 $3\to 2$ 过程需要初始态和最终态中有一个标准模型粒子。这防止了暗物质领域过热，并导致丰富的实验信号。我们通过一个由两个标量组成的暗物质领域生成共SIMP相互作用，媒介子耦合到核子或电子。在这两种情况下， \textit{暗物质候选者自然很轻}：亲核相互作用倾向于亚GeV质量范围，而亲亮子相互作用倾向于亚MeV质量范围。这些较轻质量范围内的可行热模型目前特别有趣，因为低阈值探测器技术的新发展将开始探测该参数空间区域。虽然亚MeV范围内的粒子可能会影响轻元素的形成和CMB解耦，但我们展示了晚期相变打开了大块参数空间。这些热轻暗物质模型可以改用专门实验测试。我们讨论了每种情况下在当前各种实验探针灵敏度和预期未来探测范围下可行的参数空间。 显示英文摘要

摘要： In this work, we present UV completions of the recently proposed number-changing Co-SIMP freeze-out mechanism. In contrast to the standard cannibalistic-type dark matter picture that occurs entirely in the dark sector, the $3\to 2$ process setting the relic abundance in this case requires one Standard Model particle in the initial and final states. This prevents the dark sector from overheating and leads to rich experimental signatures. We generate the Co-SIMP interaction with a dark sector consisting of two scalars, with the mediator coupling to either nucleons or electrons. In either case, \textit{the dark matter candidate is naturally light}: nucleophilic interactions favor the sub-GeV mass range and leptophilic interactions favor the sub-MeV mass range. Viable thermal models in these lighter mass regimes are particularly intriguing to study at this time, as new developments in low-threshold detector technologies will begin probing this region of parameter space. While particles in the sub-MeV regime can potentially impact light element formation and CMB decoupling, we show that a late-time phase transition opens up large fractions of parameter space. These thermal light dark matter models can instead be tested with dedicated experiments. We discuss the viable parameter space in each scenario in light of the current sensitivity of various experimental probes and projected future reach.