DESI 2024 BAO 分析中基于 fiducial 宇宙学的系统误差
宇宙学与河外天体物理
2025-05-14 v2
摘要
在从星系调查中测量Baryon Acoustic Oscillations（BAO）尺度时，通常会假设一个fiducial宇宙学，将红移测量值转换为共测距离，同时用于定义重构算法的输入参数。还会根据（可能不同于fiducial宇宙学的）宇宙学创建一个用于拟合的模板化模型。这种模型依赖性可被视为数据压缩方式，随后允许数据与所假设的fiducial宇宙学不同时进行分析。在本研究中，我们评估了DESI 2024 III中针对DESI Data Release 1（DR1）BAO分析所采用的fiducial宇宙学对最终测量值的影响。我们利用一套模拟星系目录，既符合调查的真实性，又镜像DESI DR1的轨迹：亮星系样本（BGS）、光亮红星系（LRG）、发射线星系（ELG）和类星体（QSO），覆盖红移范围0.1至2.1。我们将四个次要AbacusSummit宇宙学与DESI的fiducial宇宙学（Planck 2018）进行比较。所探索的次要宇宙学包括较低的暗物质密度、升温型暗能量宇宙、较高的有效物种数以及较低的物质聚类幅值。这些模拟数据通过一致迭代网格、模板和重构参考宇宙学来处理BAO管道。我们确定fiducial宇宙学对两性向和各向同性膨胀参数和的误差贡献为。随后我们直接测试了fiducial宇宙学对DESI DR1数据的影响。
引用
@article{arxiv.2406.06085,
title = {Fiducial-Cosmology-dependent systematics for the DESI 2024 BAO Analysis},
author = {A. Pérez-Fernández and L. Medina-Varela and R. Ruggeri and M. Vargas-Magaña and H. Seo and N. Padmanabhan and M. Ishak and J. Aguilar and S. Ahlen and S. Alam and O. Alves and U. Andrade and S. Brieden and D. Brooks and A. Carnero Rosell and X. Chen and T. Claybaugh and S. Cole and K. Dawson and A. de la Macorra and A. de Mattia and Arjun Dey and Z. Ding and P. Doel and K. Fanning and C. Garcia-Quintero and E. Gaztañaga and S. Gontcho A Gontcho and G. Gutierrez and K. Honscheid and S. Juneau and D. Kirkby and T. Kisner and A. Lambert and M. Landriau and J. Lasker and L. Le Guillou and M. Manera and P. Martini and A. Meisner and J. Mena-Fernández and R. Miquel and J. Moustakas and A. D. Myers and S. Nadathur and J. A. Newman and G. Niz and E. Paillas and N. Palanque-Delabrouille and W. J. Percival and C. Poppett and F. Prada and M. Rashkovetskyi and A. Rocher and G. Rossi and A. Sanchez and E. Sanchez and M. Schubnell and D. Sprayberry and G. Tarlé and D. Valcin and B. A. Weaver and J. Yu and H. Zou},
journal= {arXiv preprint arXiv:2406.06085},
year = {2025}
}
备注
Supporting publication of DESI 2024 III: Baryon Acoustic Oscillations from Galaxies and Quasars. Accepted version. Updated references