揭示衰变轻暗物质的杂散光：来自NuSTAR X射线观测的约束
Shedding Stray Light on Decaying Light Dark Matter: Constraints from NuSTAR X-ray Observations
AI总结：
利用NuSTAR杂散光数据，通过分析暗物质衰变产生的X射线信号，对质量在keV量级的轻暗物质模型（包括标量、ALP和暗光子）给出了最强的间接探测上限。
摘要：
轻暗物质（质量$\lesssim \mathcal{O}(100)$ keV）由于阈值限制，在多个正在进行的间接探测实验中仍然难以探测。最近来自NuSTAR杂散光数据的漫射X射线光子观测为通过银河晕中的衰变信号探测此类轻暗物质提供了强大途径。本文利用最新的NuSTAR杂散光数据，探索了衰变亲电标量暗物质、亲电和亲光ALP暗物质以及暗光子暗物质的间接探测前景。我们发现，对于产生单色双光子信号的暗物质场景，NuSTAR杂散光数据可以在$\sim6-36$ keV质量范围内给出最强的间接探测界限。相比之下，对于具有连续三光子谱的暗光子（矢量）暗物质，最强的间接探测上限出现在$\sim 20-70$ keV质量范围内。此外，我们讨论了非弹性暗物质的探测前景，其中较重的暗物质衰变为双光子或三光子末态以及一个较重的轻暗区粒子。通过将得到的连续光子谱与NuSTAR杂散光数据进行比较，我们获得了质量分裂$\Delta m$在$3 ~{ m keV}- 100$ keV范围内此类暗物质寿命的最严格上限。
英文摘要：
Light dark matter (DM) (mass $\lesssim \mathcal{O}(100)$ keV) remains challenging to detect in several ongoing indirect detection experiments due to threshold limitations. Recent observations of diffuse X-ray photons from the NuSTAR stray-light (SL) data provide a powerful avenue to probe such light DM through its decay signatures in the galactic halo. This work explores the indirect detection prospects of decaying electrophilic scalar DM, electrophilic and photophilic ALP DM, and dark photon DM using the recent NuSTAR SL data. We find that for DM scenarios producing monochromatic two-photon signals, NuSTAR SL data can yield the strongest indirect detection bound in the $7-36$ keV mass range. In contrast, for dark photon (vector) DM featuring a continuous three-photon spectrum, the strongest indirect detection upper bound arises in the $ 22-65$ keV mass range. Additionally, we discuss the detection prospects of inelastic DM where the heavier DM decays to a two or three-photon final state along with a massive lighter dark sector particle. By comparing the resulting continuous photon spectra with the NuSTAR SL data, we obtain the most stringent lower bound on the lifetime of such DM for the mass splitting $Δm$ in the range $3 ~{\rm keV}- 100$ keV.
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