Massara Elena, Villaescusa-Navarro Francisco, Ho Shirley, Dalal Neal, Spergel David N
Waterloo Centre for Astrophysics, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada.
Center for Computational Astrophysics, Flatiron Institute, 162 5th Avenue, New York, New York 10010, USA.
Phys Rev Lett. 2021 Jan 8;126(1):011301. doi: 10.1103/PhysRevLett.126.011301.
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 spectra allows us to place a 4.3σ constraint on the minimum sum of the neutrino masses with a volume equal to 1 (Gpc h^{-1})^{3} and without cosmic microwave background priors. Combinations of different marked power spectra yield a 6σ constraint within the same conditions.
这些区域具有最高的中微子与暗物质密度比。标记功率谱可用于突出低密度区域而非高密度区域，因此，它对中微子质量效应的敏感度可能比功率谱高得多。利用来自Quijote套件的22000次N体模拟，我们量化了物质场标记功率谱中的信息含量，并表明通过对所有宇宙学参数设置比2更大的改进约束，它优于标准功率谱。标记功率谱和标准功率谱的组合使我们能够在体积等于1（Gpc h⁻¹）³且无宇宙微波背景先验的情况下，对中微子质量的最小总和施加4.3σ的约束。在相同条件下，不同标记功率谱的组合产生6σ的约束。
