arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.11598astro-ph.COphysics.class-phphysics.comp-ph
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宇宙网通过引力与暗物质晕分布的联系

The cosmic web connection to the dark matter halo distribution through gravity

Francisco-Shu Kitaura, Andrés Balaguera-Antolínez, Francesco Sinigaglia, Marcos Pellejero-Ibáñez

摘要:

这项工作通过场水平的引力势研究了宇宙网和晕分布之间的联系。我们结合三个领域的研究,宇宙网分类,微扰理论扩展的晕偏差,晕(星系)模拟目录制作方法。特别是,我们使用的不变量的潮汐场和速度剪切张量作为生成函数来再现晕数计数的参考目录从全重力计算,填充网格上的暗物质场以及到非线性制度($3\,h^{-1}\,{\rm Mpc}$尺度)。我们的研究结果表明,一个前所未有的协议与参考功率谱在1%以内的$k=0.72\,h\,{\rm Mpc}^{-1}$。通过分析大尺度上的三点统计量(配置高达$k=0.2\,h\,{\rm Mpc}^{-1}$),我们发现在4.8 $σ$置信水平的非局部偏差的证据,与参考目录兼容。特别是,我们发现,潮汐各向异性聚类的详细描述在大尺度上是至关重要的,以实现这种精度在现场一级。这些发现对于分析模拟星系生产中的下一代星系调查特别重要。

英文摘要:

This work investigates the connection between the cosmic web and the halo distribution through the gravitational potential at the field level. We combine three fields of research, cosmic web classification, perturbation theory expansions of the halo bias, and halo (galaxy) mock catalogue making methods. In particular, we use the invariants of the tidal field and the velocity shear tensor as generating functions to reproduce the halo number counts of a reference catalogue from full gravity calculations, populating the dark matter field on a mesh well into the non-linear regime ($3\,h^{-1}\,{\rm Mpc}$ scales). Our results show an unprecedented agreement with the reference power spectrum within 1% up to $k=0.72\,h\,{\rm Mpc}^{-1}$. By analysing the three-point statistics on large scales (configurations of up to $k=0.2\,h\,{\rm Mpc}^{-1}$), we find evidence for non-local bias at the 4.8 $σ$ confidence level, being compatible with the reference catalogue. In particular, we find that a detailed description of tidal anisotropic clustering on large scales is crucial to achieve this accuracy at the field level. These findings can be particularly important for the analysis of the next generation of galaxy surveys in mock galaxy production.

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