3.5 keV X射线的非阿贝尔暗物质模型
Nonabelian dark matter models for 3.5 keV X-rays
摘要：
最近对XXM-牛顿数据的分析揭示了在大约3.55 keV处可能存在X射线线，这不容易用已知的原子跃迁来解释。人们提出了许多eV级衰变暗物质的模型来解释这个信号。在这里，我们探讨模型的多组分nonabelian暗物质与典型的质量~ 1-10 GeV（在某些模型中允许更高的值）和eV尺度分裂，自然产生的nonabelian规范对称性的破坏。光子和隐藏的扇形规范玻色子之间的动力学混合可以通过5维或6维算子发生。激发态的辐射衰变通过出现在一个环上的跃迁磁矩进行。衰减的激发态可以是原始的，也可以是由较轻的暗物质态的向上散射产生的。这些模型受到直接暗物质搜索或宇宙微波背景失真的显著限制，并且在搜索隐藏光子的固定目标实验中可能是可测试的。我们注意到，在未来的观测中，如果具有不同暗物质速度色散的源似乎需要不同的散射截面值来匹配观测到的线强度，则可以将上散射机制与衰变区分开来。
英文摘要：
A recent analysis of XXM-Newton data reveals the possible presence of an X-ray line at approximately 3.55 keV, which is not readily explained by known atomic transitions. Numerous models of eV-scale decaying dark matter have been proposed to explain this signal. Here we explore models of multicomponent nonabelian dark matter with typical mass ~ 1-10 GeV (higher values being allowed in some models) and eV-scale splittings that arise naturally from the breaking of the nonabelian gauge symmetry. Kinetic mixing between the photon and the hidden sector gauge bosons can occur through a dimension-5 or 6 operator. Radiative decays of the excited states proceed through transition magnetic moments that appear at one loop. The decaying excited states can either be primordial or else produced by upscattering of the lighter dark matter states. These models are significantly constrained by direct dark matter searches or cosmic microwave background distortions, and are potentially testable in fixed target experiments that search for hidden photons. We note that the upscattering mechanism could be distinguished from decays in future observations if sources with different dark matter velocity dispersions seem to require different values of the scattering cross section to match the observed line strengths.
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