Euclid：针对暗能量 3$\times$2pt 功率谱约束优化层析红移分箱
宇宙学与河外天体物理
2026-04-22 v1
摘要
我们提出了一种基于模拟的方法，以探索 Euclid 3x2pt 分析的最佳层析红移分箱策略，重点关注其首次主要数据发布（DR1）的预期配置。为此，我们 1) 模拟了一次类 Euclid 观测，并从天空中 3x2pt 场的多次实现中生成模拟剪切星表；2) 测量给定层析配置的 3x2pt Pseudo-Cl 功率谱，并推导它们对标准暗能量状态方程参数 (w0, wa) 施加的约束。对于在 LambdaCDM 宇宙学下包含高斯分布光度红移不确定性和形状噪声的模拟，我们发现，对于完整 3x2pt 信号或仅角聚类分量的分析，星系等数量分箱对 (w0, wa) 产生最佳约束。对于宇宙剪切分量，在基准共动距离上等距分箱可实现最佳 (w0, wa) 约束。然而，相对于其他分箱选择，其优势在 (w0, wa) 轮廓大小上仅占百分之几，我们得出结论：宇宙剪切对分箱方法相对不敏感。我们发现，对于任何 3x2pt 分量，在 (w0, wa) 上提取的信息增益在 7-8 个分箱时开始饱和。更多分箱带来的任何边际增益可能受限于实际测量中存在的额外不确定性，以及对协方差矩阵精度日益增加的需求。最后，我们考虑了 5% 的灾难性光度红移异常值污染，并发现，如果这些误差在分析中未得到缓解，则 10 个等数量分箱的 3x2pt 信号中引入的偏差会导致暗能量约束在 的水平上与基准 LambdaCDM 宇宙学不一致。
引用
@article{arxiv.2501.07559,
title = {Euclid: Optimising tomographic redshift binning for 3$\times$2pt power spectrum constraints on dark energy},
author = {J. H. W. Wong and M. L. Brown and C. A. J. Duncan and A. Amara and S. Andreon and C. Baccigalupi and M. Baldi and S. Bardelli and D. Bonino and E. Branchini and M. Brescia and J. Brinchmann and A. Caillat and S. Camera and V. Capobianco and C. Carbone and J. Carretero and S. Casas and M. Castellano and G. Castignani and S. Cavuoti and A. Cimatti and C. Colodro-Conde and G. Congedo and C. J. Conselice and L. Conversi and Y. Copin and F. Courbin and H. M. Courtois and A. Da Silva and H. Degaudenzi and G. De Lucia and A. M. Di Giorgio and J. Dinis and F. Dubath and X. Dupac and S. Dusini and M. Farina and S. Farrens and F. Faustini and S. Ferriol and M. Frailis and E. Franceschi and S. Galeotta and K. George and W. Gillard and B. Gillis and C. Giocoli and A. Grazian and F. Grupp and L. Guzzo and S. V. H. Haugan and W. Holmes and I. Hook and F. Hormuth and A. Hornstrup and S. Ilić and K. Jahnke and M. Jhabvala and E. Keihänen and S. Kermiche and A. Kiessling and B. Kubik and M. Kunz and H. Kurki-Suonio and S. Ligori and P. B. Lilje and V. Lindholm and I. Lloro and G. Mainetti and E. Maiorano and O. Mansutti and O. Marggraf and K. Markovic and M. Martinelli and N. Martinet and F. Marulli and R. Massey and E. Medinaceli and S. Mei and M. Melchior and Y. Mellier and M. Meneghetti and E. Merlin and G. Meylan and M. Moresco and L. Moscardini and C. Neissner and S. -M. Niemi and C. Padilla and S. Paltani and F. Pasian and K. Pedersen and V. Pettorino and S. Pires and G. Polenta and M. Poncet and L. A. Popa and F. Raison and A. Renzi and J. Rhodes and G. Riccio and E. Romelli and M. Roncarelli and E. Rossetti and R. Saglia and Z. Sakr and A. G. Sánchez and D. Sapone and B. Sartoris and P. Schneider and T. Schrabback and A. Secroun and G. Seidel and S. Serrano and C. Sirignano and G. Sirri and L. Stanco and J. Steinwagner and P. Tallada-Crespí and A. N. Taylor and I. Tereno and R. Toledo-Moreo and F. Torradeflot and I. Tutusaus and L. Valenziano and T. Vassallo and G. Verdoes Kleijn and A. Veropalumbo and Y. Wang and J. Weller and G. Zamorani and E. Zucca and C. Burigana and M. Calabrese and A. Pezzotta and V. Scottez and A. Spurio Mancini and M. Viel},
journal= {arXiv preprint arXiv:2501.07559},
year = {2026}
}
备注
Euclid Consortium paper. 28 pages, 17 figures. For submission to A&A