用PTOLEMY探测sub-eV暗物质衰变
Probing sub-eV Dark Matter decays with PTOLEMY
摘要：
当暗物质的质量低于eV尺度时，它的宇宙学占据数超过了来自宇宙微波背景的光子以及残余中微子的宇宙学占据数。如果这样的暗物质衰变为中微子对，这意味着试图探测宇宙中微子背景的实验也可能对这种额外形式的“暗辐射”敏感。在这里，我们研究的前景，检测考虑到各种选项的预测性能的未来PAPOMY实验。从一个详细的轮廓似然分析，我们发现，暗物质衰变的寿命大$10^4$陀螺仪或一个子%的暗物质分数衰减今天可以发现。从银河系和宇宙学中微子暗辐射通量引入的独特的光谱事件形状有助于前景。在这个过程中，我们还澄清了保利阻塞的重要性，在暗物质衰变。在这项工作中提出的方案可以被认为是早期的物理目标，在这些仪器的发展与放松的要求，性能和能量分辨率。
英文摘要：
When the Dark Matter mass is below the eV-scale, its cosmological occupation number exceeds the ones of photons from the cosmic microwave background as well as of relic neutrinos. If such Dark Matter decays to pairs of neutrinos, it implies that experiments that seek the detection of the cosmic neutrino background may as well be sensitive to this additional form of "dark radiation". Here we study the prospects for detection taking into account various options for the forecasted performance of the future PTOLEMY experiment. From a detailed profile likelihood analysis we find that Dark Matter decays with lifetime as large as $10^4$ Gyr or a sub-% Dark Matter fraction decaying today can be discovered. The prospects are facilitated by the distinct spectral event shape that is introduced from galactic and cosmological neutrino dark radiation fluxes. In the process we also clarify the importance of Pauli-blocking in the Dark Matter decay. The scenarios presented in this work can be considered early physics targets in the development of these instruments with relaxed demands on performance and energy resolution.
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