Cosmic Tidal Reconstruction with Halo Fields

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...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 929; no. 1; pp. 5 - 12
Main Authors Zhu, Hong-Ming, Mao, Tian-Xiang, Pen, Ue-Li
Format Journal Article
LanguageEnglish
Published Philadelphia The American Astronomical Society 01.04.2022
IOP Publishing
Subjects
Algorithms
Astronomical methods
Astrophysics
Cosmology
Dark matter
Dark matter distribution
Density
Gravitational interaction
Large-scale structure of the universe
N-body simulations
Non-Gaussianity
Perturbation
Reconstruction
Subtraction
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Summary: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 find 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 multitracer method with future cosmological surveys.
Bibliography:Galaxies and Cosmology
AAS33871
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ac5a47