渐趋升温：IceCube 接近冻结（Freeze-out）

IceCube 最近探测到了源自银河（Milky Way）的高能中微子弥散群体。研究利用这一高显著性探测结果，通过两种互补方法对暗物质（Dark matter）湮灭为中微子的过程设定了新的限制。未来的 IceCube-Gen2 和立方千米中微子望远镜（KM3NeT）观测将进一步提升灵敏度，有望对热冻结机制进行决定性检验。

arXiv:2608.26258v1 Announce Type: cross Abstract: 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.