Title: Constraints on the Cosmic Neutrino Background from NGC 1068 Show Chinese title

Title: 从NGC 1068对宇宙中微子背景的约束

Abstract: We use recent evidence of TeV neutrino events from NGC 1068, detected by the IceCube experiment, to constrain the overdensity of relic neutrinos locally and globally. Since these high-energy neutrinos have travelled long distances through a sea of relic neutrinos, they could have undergone scattering, altering their observed flux on Earth. Considering only Standard Model interactions, we constrain the relic overdensity to be $\eta\leq 3.85 \times 10^8 (5.39 \times 10^{11})$ at the 95$\%$ confidence level for overdensities with a radius of 14 Mpc (10 kpc), assuming the sum of neutrino masses saturates the cosmological bound, $\sum_i m_i = 0.13$ eV. We demonstrate that this limit improves with larger neutrino masses and how it depends on the scale of the overdensity region. Show Chinese abstract

Abstract: 我们利用IceCube实验探测到的NGC 1068中的TeV中微子事件的最新证据，来限制本地和全局的遗迹中微子过密度。由于这些高能中微子在充满遗迹中微子的海洋中旅行了很长的距离，它们可能发生散射，从而改变了地球上的观测通量。仅考虑标准模型相互作用的情况下，假设中微子质量之和达到宇宙学上限$\sum_i m_i = 0.13$eV，在半径为14 Mpc（10 kpc）的过密度区域，我们在95$\%$置信水平上将遗迹过密度限制为$\eta\leq 3.85 \times 10^8 (5.39 \times 10^{11})$。我们展示了这个限制如何随着中微子质量的增大而改善，以及它如何依赖于过密度区域的尺度。