论文标题
大量中微子对光环自旋翻转现象的影响
The Effect of Massive Neutrinos on the Halo Spin Flip Phenomenon
论文作者
论文摘要
光环旋转翻转是指暗光孔的旋转轴的质量高于一定阈值的现象，往往优先将垂直于宿主大规模细丝的垂直固定，而低质量的光环却倾向于使其旋转轴与此类结构平行。迄今为止，已经在冷暗物质的假设下进行了广泛的工作，以理解这种现象，并建议其起源应与各向异性宇宙网络中光晕角动量的非线性演化密切相关。我们首次提出了假设存在大量中微子的数值检查，这是对这种现象的存在，从而发现阈值质量对自旋翻转对总中微子质量的依赖性明显且稳健。我们的物理解释是，更大的中微子的存在阻碍了宇宙网络的非线性演化，这反过来允许Halo旋转矢量更好地保留对非线性趋势中最初的潮汐相互作用的记忆。我们的发现表明，光环旋转与大规模结构的统计比对原则上可以用作总中微子质量的探针。
The halo spin flip refers to the phenomenon that the spin axes of dark matter halos with masses above a certain threshold tend to be preferentially aligned perpendicular to the hosting large-scale filaments, while low-mass halos tend to have their spin axes aligned parallel to such structures. Extensive work has so far been conducted to understand this phenomenon under the assumption of cold dark matter and suggested that its origin should be closely related to the nonlinear evolution of the halo angular momentum in the anisotropic cosmic web. We present, for the first time, a numerical examination of this phenomenon assuming the presence of massive neutrinos, finding a clear and robust dependence of the threshold mass for the spin flip on the total neutrino mass. Our physical explanation is that the presence of more massive neutrinos retard the nonlinear evolution of the cosmic web, which in turn allows the halo spin vectors to better retain their memories of the initial tidal interactions in the nonlinear regime. Our finding implies that the statistical alignment of halo spins with the large-scale structures can be in principle used as a probe of the total neutrino mass.
