近日，天津师范大学的赵熠与中国科学院高能所的殷鹏飞以及中山大学的林苏杰等人合作并取得一项新进展。经过不懈努力，他们揭示邻近亚晕对源自宇宙射线反质子的暗物质湮灭约束的影响。相关研究成果已于2024年2月15日在国际知名学术期刊《中国物理C》上发表。

在这项研究中，研究人员人员深入探究了宇宙射线反质子谱，以研究假设的亚晕存在，并据此设定了暗物质（DM）湮灭截面的上限。他们通过对比存在与不存在邻近亚晕两种情况下的湮灭截面极限比值，从而定量评估了邻近亚晕对DM湮灭截面极限的潜在影响。同时，研究人员还全面考虑了浓度模型和亚晕概率分布对研究结果的影响。

进一步地，他们探索了在约1.4 TeV的DAMPE e^±谱中，潜在DM亚晕邻近的反质子贡献，并发现当前的AMS-02反质子数据并未对这种贡献形成明显限制。

据悉，无数的模拟表明，银河系内应存在大量的亚晕结构。这些邻近的亚晕可能对人们理解暗物质具有重要意义。

附：英文原文

Title: Impact of a nearby subhalo on the constraint of dark matter annihilation from cosmic ray antiprotons

Author: Yi Zhao, Xiao-Jun Bi, Su-Jie Lin, Peng-Fei Yin

Issue&Volume: 2024-02-15

Abstract: Numerous simulations indicate that a large number of subhalos should be hosted by the Milky Way. The potential existence of a nearby subhalo could have important implications for our understanding of dark matter (DM) annihilation. In this study, we investigate the hypothetical presence of a nearby subhalo and set the upper limits on the DM annihilation cross section by analyzing the cosmic-ray antiproton spectrum. By presenting the ratios of annihilation cross section limits for scenarios with and without a nearby subhalo, we can quantitatively evaluate the potential impact of the nearby subhalo on the limits of the DM annihilation cross section. The impacts of the concentration model and the subhalo probability distribution have been considered. We explore the antiproton contribution of the potential nearby DM subhalo accounting for the DAMPE e^± spectrum at ～1.4 TeV and find that the current AMS-02 antiproton results do not limit this contribution.

DOI: 10.1088/1674-1137/ad13f7

Source: http://hepnp.ihep.ac.cn/article/doi/10.1088/1674-1137/ad13f7