通过GRAND透镜的宇宙中微子揭示了宇宙加速器的性质
Cosmogenic Neutrinos Through the GRAND Lens Unveil the Nature of Cosmic Accelerators
摘要：
能量超过55电子伏特的宇宙射线的来源仍然是个谜。被称为宇宙成因中微子通量的超高能中微子的保证关联通量将由下一代无线电设施测量，例如拟议的中微子探测巨型无线电阵列（GRAND）。利用宇宙成因中微子流提供的正交信息，我们确定了GRAND约束源红移演化和宇宙线源化学组成的前景。如果红移的演化是已知的，那么不管GRAND的能量分辨率如何，拥有200，000个天线的GRAND将在一年的数据采集后将质子/铁的分数限制在$\sim5-10\%$水平;另一方面，如果给出了平均源成分的提示，GRAND将测量源的红移演化到$\sim 10\%$不确定性。然而，预见的配置的GRAND单独将无法打破之间的红移演化的源和它们的组成简并。我们的研究结果强调了下一代无线电阵列探测器的识别潜力，并激励在这个方向上进一步努力。
英文摘要：
The sources of cosmic rays with energies above 55 EeV are still mysterious. A guaranteed associated flux of ultra high energy neutrinos known as the cosmogenic neutrino flux will be measured by next generation radio facilities, such as the proposed Giant Radio Array for Neutrino Detection (GRAND). By using the orthogonal information provided by the cosmogenic neutrino flux, we here determine the prospects of GRAND to constrain the source redshift evolution and the chemical composition of the cosmic ray sources. If the redshift evolution is known, independently on GRAND's energy resolution, GRAND with 200,000 antennas will constrain the proton/iron fraction to the $\sim5-10\%$ level after one year of data taking; on the other hand, if hints on the average source composition are given, GRAND will measure the redshift evolution of the sources to a $\sim 10\%$ uncertainty. However, the foreseen configuration of GRAND alone will not be able to break the degeneracy between redshift evolution of the sources and their composition. Our findings underline the discriminating potential of next generation radio array detectors and motivate further efforts in this direction.
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