Dark matter (DM) as a thermal relic of the primordial plasma is increasingly pressured by direct and indirect searches, while the same production mechanism in a decoupled sector is much less constrained. We extend the standard treatment of the freeze-out process to such scenarios and perform precision calculations of the annihilation cross-section required to match the observed DM abundance. We demonstrate that the difference to the canonical value of this ‘thermal cross-section’ is generally sizeable, and can reach orders of magnitude. Our results directly impact the interpretation of DM searches in hidden sector scenarios.

中文翻译：

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解耦扇区中精确的暗物质遗迹丰度

暗物质（DM）作为原始等离子体的热遗物，受到直接和间接搜索的压力越来越大，而去耦部门中的相同生产机制受到的约束则少得多。我们将冻结过程的标准处理扩展到此类情况，并对与观测到的DM丰度匹配所需的an没横截面进行精确计算。我们证明，与该“热横截面”的规范值的差异通常是相当大的，并且可以达到几个数量级。我们的结果直接影响隐藏部门场景中DM搜索的解释。