论文标题
通往载体 - 门户暗物质遗物丰富的新途径
New Pathways to the Relic Abundance of Vector-Portal Dark Matter
论文作者
论文摘要
我们在参数空间区域中充分探索了矢量 - 门户暗物质模型的热冷冻历史，在该区域中，深色光子$ a^{\ prime} $的质量和深色物质$χ$在范围内$ 1 \ lyseSim m_ {a^{a^{\ prime}}/m_χ×sim sim sim sim sim sim sim sim sim sim sim。在该地区，$ 2 \ rightarrow 2 $和$ 3 \ rightarrow 2 $ an灭过程，以及在黑暗扇区和标准模型之间传递能量的过程，在控制暗物质的热冻结中起着重要作用。我们仔细跟踪所有物种的温度，放松了先前研究的假设，即深色和标准模型扇区在整个暗物质冻结过程中保持热量平衡。我们的计算揭示了一系列新型途径，这导致了观察到的暗物质遗物密度，我们对这些不同的方案产生了简单的分析理解。我们模型中的可行参数空间为未来寻找光线（MEV-GEV）暗物质的实验提供了一个目标，并包括暗物质自我交联横截面足够大以影响星系的小规模结构的区域。
We fully explore the thermal freezeout histories of a vector-portal dark matter model, in the region of parameter space in which the ratio of masses of the dark photon $A^{\prime}$ and dark matter $χ$ is in the range $1 \lesssim m_{A^{\prime}}/m_χ \lesssim 2$. In this region $2 \rightarrow 2$ and $3 \rightarrow 2$ annihilation processes within the dark sector, as well as processes that transfer energy between the dark sector and the Standard Model, play important roles in controlling the thermal freezeout of the dark matter. We carefully track the temperatures of all species, relaxing the assumption of previous studies that the dark and Standard Model sectors remain in thermal equilibrium throughout dark matter freezeout. Our calculations reveal a rich set of novel pathways which lead to the observed relic density of dark matter, and we develop a simple analytic understanding of these different regimes. The viable parameter space in our model provides a target for future experiments searching for light (MeV-GeV) dark matter, and includes regions where the dark matter self-interaction cross section is large enough to affect the small-scale structure of galaxies.
