Export citation

Export citation

Choose format for download:

Download Citation

    Tomographic Alcock-Paczynski test with marked correlation functions

    Liang Xiao1, Limin Lai2, Zhujun Jiang1, Xiao-Dong Li1,*, and Le Zhang1,3,†

    • *Contact author: lixiaod25@mail.sysu.edu.cn
    • †Contact author: zhangle7@mail.sysu.edu.cn

    Phys. Rev. D 112, 123510 – Published 4 December, 2025

    DOI: https://doi.org/10.1103/9gg5-wm7t

    Abstract

    The tomographic Alcock-Paczynski (AP) method, developed over the past decade, exploits redshift evolution for cosmological determination, aiming to mitigate contamination from redshift distortions and capture nonlinear scale information. Marked correlation functions (MCFs) extend information beyond the two-point correlation. For the first time, this study integrated the tomographic AP test with MCFs to constrain the flat w cold dark matter (wCDM) cosmology model. Our findings show that multiple density weights in MCFs outperform the traditional two-point correlation function, reducing the uncertainties of the matter density parameter Ωm and dark energy equation of state w by 48% and 45%, respectively. Furthermore, we introduce a novel principal component analysis (PCA) compression scheme that efficiently projects high-dimensional statistical measurements into a compact set of eigenmodes while preserving most of the cosmological information. This approach retains significantly more information than traditional coarse binning methods, which simply average adjacent bins in a lossy manner, yielding an additional ∼40% reduction in error margins. To assess robustness, we incorporate realistic redshift errors expected in future spectroscopic surveys. While these errors modestly degrade cosmological constraints, our combined framework, which utilizes MCFs and PCA compression within tomographic AP tests, is less affected and always yields tight cosmological constraints. This scheme remains highly promising for upcoming slitless spectroscopic surveys, such as the Chinese Space Station Telescope (CSST).

    Physics Subject Headings (PhySH)

    Authorization Required

    We need you to provide your credentials before accessing this content.

    References (Subscription Required)

    Outline

    Information

    Sign In to Your Journals Account

    Filter

    Filter

    Article Lookup

    Enter a citation