AI 中文总结
本研究利用 IceCube 探测到的银河系弥散高能中微子，通过两种互补方法对暗物质湮灭为中微子设置新限制，证明该中微子测量可作为暗物质探测工具，未来观测有望检验热冻结机制。
AI 中文摘要
IceCube 近期探测到了来自银河系的弥散高能中微子种群。我们利用这一高显著性探测结果，通过两种互补方法对暗物质（DM）湮灭为中微子的过程设置新的限制。第一种方法利用经本底扣除的簇射事件银经分布，对暗物质湮灭截面设置保守约束，该约束不依赖任何假设的银河系宇宙射线发射模型；由此得到的速度平均湮灭截面限制，比现有界限提升了数倍。第二种方法利用依赖模板的银河系内部中微子能谱，该能谱是在不同银河系宇宙射线发射模型下推断得到的。这种互补方法表明，对于一系列 TeV 尺度的暗物质质量，推断得到的银河系中微子强度已对接近热遗迹基准的暗物质贡献敏感，不过该对比更依赖模型。我们的结果证明，对银河系弥散中微子发射的测量可作为探测暗物质湮灭为中微子的有力工具。IceCube-Gen2 和 KM3NeT 的未来观测将大幅提升这种灵敏度，有望通过银河系中微子观测对热冻结机制进行决定性检验。
英文摘要
IceCube has recently detected a diffuse population of high-energy neutrinos arising from the Milky Way. We use this high-significance detection to place new limits on dark matter (DM) annihilation to neutrinos with two complementary approaches. The first method uses the background-subtracted Galactic longitude distribution of shower events to place a conservative bound on the DM annihilation cross section that does not rely on any assumed Galactic cosmic ray emission model; the resulting limits on the velocity-averaged annihilation cross section improve upon existing bounds by factors of a few. The second method uses the template-dependent neutrino energy spectra from the Inner Galaxy, inferred under different Galactic cosmic ray emission models. This complementary approach shows that the inferred Galactic neutrino intensities are already sensitive to DM contributions near the thermal-relic benchmark for a range of TeV-scale DM masses, though this comparison is more model-dependent. Our results demonstrate that measurements of diffuse Galactic neutrino emission can be used as a powerful probe of DM annihilation into neutrinos. Future observations with IceCube-Gen2 and KM3NeT will substantially extend this sensitivity, potentially allowing a decisive test of the thermal freeze-out mechanism with Galactic neutrino observations.
Comments7 pages, 2 figures. End Matter (5 pages, 6 figures)
