利用标记功率谱探测大尺度结构中的中微子特征
Using the Marked Power Spectrum to Detect the Signature of Neutrinos in Large-Scale Structure
摘要：
宇宙中微子在空洞中的影响最大：空洞是中微子与暗物质密度比最高的区域。标记的功率谱可以用来强调低密度区域而不是高密度区域，因此对中微子质量的影响可能比功率谱敏感得多。使用22，000个来自Quijote套件的N体模拟，我们量化了物质场的标记功率谱中的信息内容，并通过对所有宇宙学参数设置大于2的因子改进约束，表明它优于标准功率谱。结合标记功率谱和标准功率谱，可以对体积等于1（Gpc/h）^[3]且没有CMB先验的中微子质量的最小总和设置4.3σ的约束。不同标记功率谱的组合在相同条件下产生6σ约束。
英文摘要：
Cosmological neutrinos have their greatest influence in voids: these are the regions with the highest neutrino to dark matter density ratios. The marked power spectrum can be used to emphasize low density regions over high density regions, and therefore is potentially much more sensitive than the power spectrum to the effects of neutrino masses. Using 22,000 N-body simulations from the Quijote suite, we quantify the information content in the marked power spectrum of the matter field, and show that it outperforms the standard power spectrum by setting constraints improved by a factor larger than 2 on all cosmological parameters. The combination of marked and standard power spectrum allows to place a 4.3σ constraint on the minimum sum of the neutrino masses with a volume equal to 1 (Gpc/h)^3 and without CMB priors. Combinations of different marked power spectra yield a 6σ constraint within the same conditions.
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