Explanation of the 511 keV line: cascade annihilating dark matter with the Be-8 anomaly
Explanation of the 511 keV line: cascade annihilating dark matter with the Be-8 anomaly
复制标题
511 keV线的解释：暗物质与Be-8异常的级联湮灭
DOI：
10.1140/epjc/s10052-018-5555-0
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发表时间：
2018
影响因子：
4.4
通讯作者：
Jia Lian-Bao
中科院分区：
文献类型：
--
作者：
Jia Lian-Bao
一个可能的暗物质（DM）解释银河系511 keV线的长期存在的问题进行了探讨。对于DM级联湮灭的关注，DM对湮灭到不稳定的，和衰变到新的相互作用建议的Be异常。考虑到有效中微子数和511keV γ射线辐射的约束，得到了DM的范围MeV。现今典型的DM湮没截面约为3.3cms，这可以解释511keV谱线。MeV尺度的DM可以通过DM电子散射来寻找，并且导出了DM直接探测中CMB s波湮灭所设定的上限。
A possible dark matter (DM) explanation about the long-standing issue of the Galactic 511 keV line is explored in this paper. For DM cascade annihilations of concern, a DM pairannihilates into unstable, anddecays intowith new interactions suggested by theBe anomaly. Considering the constraints from the effective neutrino numberand the 511 keV gamma-ray emission, a range of DM is obtained,MeV. The typical DM annihilation cross section today is about 3.3cms, which can give an explanation about the 511 keV line. The MeV scale DM may be searched by the DM-electron scattering, and the upper limit set by the CMB s-wave annihilation is derived in DM direct detections.