发表机构
Institute of Theoretical Physics, Chinese Academy of Sciences（中国科学院理论物理研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用银河系最快恒星S301的极端轨道特性，通过计算暗物质-质子散射的能量沉积，证明其可作为探测暗物质-重子相互作用的灵敏探针。
AI 中文摘要
S301的近期发现为研究银河系最内层区域的暗物质-重子相互作用提供了独特机会。S301围绕人马座A*运行，轨道高度偏心，其近心点距离仅约12天文单位，速度约为25000公里/秒。这些极端特性使S301对星系中心的暗物质-重子散射高度敏感，而该区域的暗物质密度可能被强烈增强。我们计算了S301通过暗物质-质子散射的轨道平均能量沉积率，并表明在广泛的暗物质参数空间中，满足地面实验和天文观测现有约束的散射截面能够注入足够能量，从而改变S301的光度和演化。我们的结果确立了S301作为暗物质-重子相互作用的极其灵敏探针的地位，并为在高密度和高速度天体物理环境中探测暗物质相互作用开辟了新途径。
英文摘要
The recent discovery of S301 provides an unique opportunity to investigate dark matter-baryon interaction in the innermost region of the Milky Way. S301 follows a highly eccentric orbit around Sgr~A*, and its pericenter distance is only around 12 AU with velocity about $25000\,{\rm km/s}$. These extreme properties make S301 highly sensitive to dark matter-baryon scattering in the center of galaxy, where the dark matter density may be strongly enhanced. We have calculated the orbit-averaged energy deposited rate in S301 via dark matter-proton scattering, and show that over a broad dark matter parameter space, cross sections satisfying the existing bounds from terrestrial experiments and astronomical observations can inject sufficient energy to modify the luminosity and evolution of S301. Our results establish S301 as an exceptionally sensitive probe of dark matter-baryon interactions and open a new avenue for probing dark matter interactions in high-density and high-velocity astrophysical environments.
Comments7 pages, 2 figures, 1 table
