Where shadows lie: reconstruction of anisotropies in the neutrino sky
Where shadows lie: reconstruction of anisotropies in the neutrino sky
复制标题
DOI：
10.1088/1475-7516/2023/10/010
复制
发表时间：
2023-07
影响因子：
6.4
通讯作者：
W. Elbers;C. Frenk;A. Jenkins;Baojiu Li;S. Pascoli;J. Jasche;G. Lavaux;V. Springel
中科院分区：
文献类型：
--
作者：
W. Elbers;C. Frenk;A. Jenkins;Baojiu Li;S. Pascoli;J. Jasche;G. Lavaux;V. Springel
宇宙中微子背景（CNB）编码了丰富的信息，但尚未被直接观测到。为了确定探测的前景和研究其信息含量，我们从银河系200 h-1 Mpc内物质的三维分布重建了局部遗迹中微子的相空间分布.我们的分析依赖于2 M ++星系目录的约束实现模拟和正向建模。我们发现中微子的角分布与投射的物质密度是反相关的，这是由于中微子被沿着视线的大质量结构捕获和偏转。相关的氚捕获实验，我们发现，引力集群效应的大尺度结构上的中微子的本地数密度比银河系的中微子质量小于0.1 eV的更重要。然而，我们预测残余中微子的密度接近宇宙平均值，对于质量为（0.01，0.05，0.1）eV的中微子，其密度比平均值（-0.3%，+7%，+27%）有所抑制或增强。这意味着像PIMMY这样的氚捕获实验的事件率只会有轻微的增加。我们还预测，CNB和CMB的休息帧符合0.01 eV的中微子，但中微子速度显着扰动的质量大于0.05 eV。无论质量，我们发现中微子偶极子和黄道面之间的角度是小的，这意味着近最大的年度调制的整体速度。沿着这篇论文，我们公开发布了我们的模拟数据，包括六种不同中微子质量的100多个模拟。
The Cosmic Neutrino Background (CNB) encodes a wealth of information, but has not yet been observed directly. To determine the prospects of detection and to study its information content, we reconstruct the phase-space distribution of local relic neutrinos from the three-dimensional distribution of matter within 200 h -1 Mpc of the Milky Way. Our analysis relies on constrained realization simulations and forward modelling of the 2M++ galaxy catalogue. We find that the angular distribution of neutrinos is anti-correlated with the projected matter density, due to the capture and deflection of neutrinos by massive structures along the line of sight. Of relevance to tritium capture experiments, we find that the gravitational clustering effect of the large-scale structure on the local number density of neutrinos is more important than that of the Milky Way for neutrino masses less than 0.1 eV. Nevertheless, we predict that the density of relic neutrinos is close to the cosmic average, with a suppression or enhancement over the mean of (-0.3%, +7%, +27%) for masses of (0.01, 0.05, 0.1) eV. This implies no more than a marginal increase in the event rate for tritium capture experiments like PTOLEMY. We also predict that the CNB and CMB rest frames coincide for 0.01 eV neutrinos, but that neutrino velocities are significantly perturbed for masses larger than 0.05 eV. Regardless of mass, we find that the angle between the neutrino dipole and the ecliptic plane is small, implying a near-maximal annual modulation in the bulk velocity. Along with this paper, we publicly release our simulation data, comprising more than 100 simulations for six different neutrino masses.