超高能宇宙射线的暗物质中继
Dark-matter relay for ultra-high-energy cosmic rays
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- Lomonosov Moscow State University（莫斯科国立罗蒙诺索夫大学）
- Institute for Nuclear Research of the Russian Academy of Sciences（俄罗斯科学院核物理研究所）
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中文总结 AI 辅助
本文提出暗物质中继机制，将遥远源的超高能宇宙射线转移至观测者，并证明对质量约25 MeV的费米子暗物质可观测。
中文摘要 AI 辅助
超高能宇宙射线（UHECRs）的天体物理源尚未被确认，即使对于最高能量的事件，也没有确定附近的宇宙加速器。此外，HiRes实验以及最近的望远镜阵列实验发现了部分UHECR通量与遥远耀变体之间令人困惑的相关性。在此，我们提出暗物质可以提供一种机制，有效地将UHECRs从遥远源转移：暗物质粒子在源附近被UHECRs加速，并将其动量传递给靠近观测者的重子。由于暗物质-重子截面随能量增长，这种中继的概率不可忽略。我们证明，对于质量$m_{\mathrm{DM}} \sim 25$ MeV的费米子暗物质，该效应是可观测的，并讨论了该机制可能的观测特征。
英文摘要
Astrophysical sources of ultra-high-energy cosmic rays (UHECRs) remain unidentified, and no nearby cosmic accelerators are established even for the highest-energy events. In addition, puzzling correlations of a fraction of UHECR flux with distant blazars were found by HiRes and, recently, Telescope Array experiments. Here we propose that dark matter can provide a mechanism to effectively transfer UHECRs from distant sources: dark-matter particles are boosted by UHECRs near the source and pass their momentum to baryons close to the observer. The probability of this relay is not negligible because of the growth of dark-matter-baryon cross section with energy. We demonstrate that the effect is observable for fermionic dark matter of mass $m_{\mathrm{DM}} \sim 25$ MeV and discuss possible observational signatures of this mechanism.
