It is assumed that two types of dark matter particles exist: superheavy dark matter particles (SHDM), the mass of which ∼ inflaton mass, and light fermion dark matter (DM) particles, which are the ultrahigh energy (UHE) products of the decay of SHDM. The Earth will be taken as a detector to search for the UHE DM particles directly. These upward-going particles, which pass through the Earth and air and interact with nuclei, can be detected by the fluorescence detectors (FD) of the Pierre Auger Observatory (Auger), via fluorescent photons due to the development of an extensive air shower. The numbers and fluxes of expected UHE DM particles are evaluated in the incoming energy range between 1 EeV and 1 ZeV with the different lifetimes of decay of SHDM and mass of Z′. According to the Auger data from 2008 to 2019, the upper limit for UHE DM fluxes is also estimated at 90% confidence limit with the FD of Auger. Finally, it is reasonable to make a conclusion that UHE DM particles could be directly detected in the energy range between O(1 EeV) and O(10 EeV) with the FD of Auger. This might prove whether SHDM particles exist in the Universe.

中文翻译：

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在皮埃尔奥格天文台直接测量上行超高能暗物质

假设存在两种类型的暗物质粒子：超重暗物质粒子（SHDM），其质量~暴胀子质量，以及轻费米子暗物质（DM）粒子，它们是衰变的超高能（UHE）产物SHDM的。地球将作为探测器直接搜索UHE DM粒子。这些向上运动的粒子穿过地球和空气并与原子核相互作用，由于广泛的空气簇射的发展，皮埃尔奥格天文台 (Auger) 的荧光探测器 (FD) 可以通过荧光光子检测到这些粒子。预期 UHE DM 粒子的数量和通量在 1 EeV 和 1 ZeV 之间的入射能量范围内进行评估，其中 SHDM 的衰变寿命和 Z' 的质量不同。根据 2008 年至 2019 年的俄歇数据，UHE DM 通量的上限也用 Auger 的 FD 估计为 90% 的置信限。最后，可以合理地得出结论，在O(1 EeV)和O(10 EeV)之间的能量范围内，利用Auger的FD可以直接检测到UHE DM粒子。这或许可以证明宇宙中是否存在 SHDM 粒子。