发表机构
University of Alberta; UCLA; Istituto Nazionale di Fisica Nucleare, Sezione di Napoli; University of Oslo（阿尔伯塔大学; 加州大学洛杉矶分校; 意大利国家核物理研究所那不勒斯分部; 奥斯陆大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究评估大麦哲伦云引力对暗物质速度分布的影响，发现其显著改变非弹性吸热暗物质模型参数空间，而弹性模型受影响较小，强调探测高速暗物质时须考虑LMC效应。
AI 中文摘要
大麦哲伦云（LMC）的引力作用显著改变了局部暗物质（DM）速度分布，产生了高速尾部。我们评估了LMC如何重塑多种理论模型下的暗物质景观，以近期疑似LZ暗物质事件为背景。我们表明，LMC引起的速度偏移在广泛可能的相互作用范围内显著修改了非弹性吸热暗物质模型的参数空间，将可行区域推向更大的质量分裂，这些区域更容易受到对撞机和间接探测约束的影响。相比之下，弹性碰撞暗物质模型受影响较小，其中一些仍是可行的候选者——例如，在希格斯盲点处的简单轻量Singlet-Doublet Majorana暗物质候选者。我们的工作证实，在探测高速暗物质时，准确考虑LMC效应至关重要，而非依赖简化的标准晕模型。
英文摘要
The local dark matter (DM) velocity distribution is significantly altered by the gravitational impact of the Large Magellanic Cloud (LMC), which creates a high-velocity tail. We evaluate how the LMC reshapes the DM landscape for a wide variety of theoretical models in light of the recent putative LZ DM event. We show that the LMC-induced velocity shifts substantially modify the parameter space for inelastic endothermic DM models across a broad range of possible interactions, driving the viable regions towards larger mass splittings, which are more susceptible to collider and indirect detection constraints. By contrast, models for elastically colliding DM are less impacted, and some remain viable candidates -- for example, the simple light Singlet-Doublet Majorana DM candidate at the Higgs blind spot. Our work confirms that accurately accounting for LMC effects is essential when high-velocity DM is probed, rather than relying on the simplified Standard Halo Model.
Comments26 pages, 5 figures, 5 tables
