AI 中文总结
该研究在含大质量矢量中介子的费米子暗物质模型中，利用冰立方数据推导参数约束，发现其探测亚GeV暗物质的灵敏度优于传统直接探测，信号由深度非弹性散射主导。
AI 中文摘要
我们在一个具有与夸克耦合的大质量矢量中介子的费米子暗物质模型中，研究了冰立方（IceCube）对耀变体增强暗物质的灵敏度。为此，我们计算了来自324个耀变体的弥散通量，这些耀变体的质子谱是通过多波段观测推断得到的，我们采用了超大质量黑洞周围的保守暗物质尖峰分布，并一致考虑了在地球中传播时的衰减效应。暗物质-核子散射截面通过包含弹性、共振单π产生以及深度非弹性贡献来计算，特别强调了共振单π产生道，以平滑覆盖弹性与深度非弹性区域之间的过渡。利用冰立方的中微子数据，我们推导了该模型参数空间的约束，并表明这种探测策略在暗物质质量低于约1 GeV时，可超越传统直接探测实验的灵敏度。我们发现，信号由深度非弹性散射主导，因此对相对较重的中介子更为敏感，而共振过程会使事例率降低，在实验阈值附近可达约9%。我们的结果表明，冰立方通过观测耀变体增强的暗物质，是亚GeV暗物质场景的强大探针。
英文摘要
We study the sensitivity of IceCube to blazar-boosted dark matter in a fermionic dark matter model with a massive vector mediator coupling to quarks. To this aim, we compute the diffuse flux arising from a sample of 324 blazars with proton spectra inferred from multiwavelength observations, adopting conservative dark matter spike profiles around the central supermassive black holes and consistently accounting for attenuation effects during propagation through the Earth. The dark matter-nucleon scattering cross section is evaluated by including elastic, resonant single pion production, and deep inelastic contributions, with particular emphasis on resonant single-pion production channels in order to smoothly cover the transition between the elastic and deep inelastic regimes. Using IceCube neutrino data, we derive constraints on the parameter space of the model and show that this detection strategy can surpass the sensitivity of conventional direct-detection experiments for dark matter masses below $\sim 1$ GeV. We find that the signal is dominated by deep inelastic scattering and is therefore more sensitive to comparatively heavy mediators, while resonance processes provide a reduction of the event rate, reaching up to about $9\%$ near the experimental threshold. Our results demonstrate that IceCube constitutes a powerful probe of sub-GeV dark matter scenarios through the observation of blazar-boosted dark matter.
Comments21 pages, 6 figures
