arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2108.01575astro-ph.CO
收藏

用晕场重建宇宙潮汐

Cosmic Tidal Reconstruction with Halo Fields

Hong-Ming Zhu, Tian-Xiang Mao, Ue-Li Pen

摘要:

大尺度扰动和小尺度扰动之间的引力耦合导致小尺度物质分布的各向异性畸变。因此,测量的局部小尺度功率谱可以用来推断大尺度物质分布。本文提出了一种利用全三维潮汐切变信息重建大尺度模态的新算法。将其应用于模拟的暗物质晕场,重建的大尺度密度场与原始物质密度场在大尺度上有很好的相关性,改进了以往只使用两个横向剪切场的潮汐重建方法。这对于在未来的宇宙学观测中利用多示踪剂方法恢复由于前景扣除而丢失的21 cm径向模和约束原始非高斯性具有深远的意义。

英文摘要:

The gravitational coupling between large-scale perturbations and small-scale perturbations leads to anisotropic distortions of the small-scale matter distribution. The measured local small-scale power spectrum can thus be used to infer the large-scale matter distribution. In this paper, we present a new tidal reconstruction algorithm for reconstructing large-scale modes using the full three-dimensional tidal shear information. We apply it to simulated dark matter halo fields and the reconstructed large-scale density field correlates well with the original matter density field on large scales, improving upon the previous tidal reconstruction method which only uses two transverse shear fields. This has profound implications for recovering lost 21~cm radial modes due to foreground subtraction and constraining primordial non-Gaussianity using the multi-tracer method with future cosmological surveys.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑