Euclid 准备工作：实空间中 2 点和 3 点关联函数的全形态建模
宇宙学与河外天体物理
2026-03-18 v1
摘要
我们检讨了关于 2 点 (2PCF) 和 3 点 (3PCF) 关联函数在实空间中的扰动模型的准确性和有效范围，旨在为即将到来的 Euclid 任务红外样本分析提供支持。我们利用来自四个快照的聚类测量数据，分别来自 Flagship I N-body 模拟，仿真的红移为 z = {0.9, 1.2, 1.5, 1.8}，这些数据在理想情况下（即不存在观测效应如纯度和完整性）下模拟了预期的星系分布。对于 3PCF，我们考虑所有可用的三角形配置，给定最小分离。首先，我们通过固定宇宙学参数并评估扰动偏置展开在联合分析两种统计数据的拟合优度来检验模型性能，在 20 Mpc/h 的分离距离下发现整体上与数据一致。随后，我们在国家领先的基础上扩展了分析，纳入三个宇宙学参数的依赖性：标量扰动幅度 As、物质密度 cdm 和哈勃参数 h。为此，我们开发了一种能够为两种概括统计量生成快速稳健建模预测的仿真器，允许高效抽样联合似然函数。我们因此提出了首个对实空间 2PCF 和 3PCF 的全形态联合分析，测试了扰动模型在两种探针下的一致性和约束能力，并评估了其在组合似然框架下的性能。我们探讨了扰动模型在小尺度引起的可能系统不确定性，发现当施加额外限制（即限于接近等腰三角形配置）后，3PCF 的最佳尺寸切割为 rmin = 30 Mpc/h。该工作是 Euclid 准备工作系列的一部分，用于验证星系聚类理论模型。
引用
@article{arxiv.2506.22257,
title = {Euclid preparation. Full-shape modelling of 2-point and 3-point correlation functions in real space},
author = {Euclid Collaboration and M. Guidi and A. Veropalumbo and A. Pugno and M. Moresco and E. Sefusatti and C. Porciani and E. Branchini and M. -A. Breton and B. Camacho Quevedo and M. Crocce and S. de la Torre and V. Desjacques and A. Eggemeier and A. Farina and M. Kärcher and D. Linde and M. Marinucci and A. Moradinezhad Dizgah and C. Moretti and K. Pardede and A. Pezzotta and E. Sarpa and A. Amara and S. Andreon and N. Auricchio and C. Baccigalupi and D. Bagot and M. Baldi and S. Bardelli and P. Battaglia and A. Biviano and M. Brescia and S. Camera and G. Cañas-Herrera and V. Capobianco and C. Carbone and V. F. Cardone and J. Carretero and M. Castellano and G. Castignani and S. Cavuoti and K. C. Chambers and A. Cimatti and C. Colodro-Conde and G. Congedo 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 H. Dole and M. Douspis and F. Dubath and X. Dupac and S. Dusini and S. Escoffier and M. Farina and R. Farinelli and F. Faustini and S. Ferriol and F. Finelli and P. Fosalba and S. Fotopoulou and M. Frailis and E. Franceschi and M. Fumana and S. Galeotta and B. Gillis and C. Giocoli and J. Gracia-Carpio and A. Grazian and F. Grupp and L. Guzzo and S. V. H. Haugan and W. Holmes and F. Hormuth and A. Hornstrup and K. Jahnke and M. Jhabvala and B. Joachimi and E. Keihänen and S. Kermiche and A. Kiessling and B. Kubik and M. Kümmel and M. Kunz and H. Kurki-Suonio and A. M. C. Le Brun and S. Ligori and P. B. Lilje and V. Lindholm and I. Lloro and G. Mainetti and D. Maino and E. Maiorano and O. Mansutti and S. Marcin 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 A. Mora and B. Morin and L. Moscardini and E. Munari and C. Neissner and S. -M. Niemi and C. Padilla and S. Paltani and F. Pasian and K. Pedersen and W. J. Percival and V. Pettorino and S. Pires and G. Polenta and M. Poncet and L. A. Popa and F. Raison and R. Rebolo and A. Renzi and J. Rhodes and G. Riccio and E. Romelli and M. Roncarelli and R. Saglia and Z. Sakr and A. G. Sánchez and D. Sapone and B. Sartoris and J. A. Schewtschenko and P. Schneider and T. Schrabback and M. Scodeggio and A. Secroun and G. Seidel and M. Seiffert and S. Serrano and P. Simon and C. Sirignano and G. Sirri and A. Spurio Mancini and L. Stanco and J. Steinwagner and P. Tallada-Crespí and D. Tavagnacco and A. N. Taylor and I. Tereno and N. Tessore and S. Toft and R. Toledo-Moreo and F. Torradeflot and A. Tsyganov and I. Tutusaus and L. Valenziano and J. Valiviita and T. Vassallo and G. Verdoes Kleijn and Y. Wang and J. Weller and G. Zamorani and F. M. Zerbi and E. Zucca and V. Allevato and M. Ballardini and M. Bolzonella and E. Bozzo and C. Burigana and R. Cabanac and M. Calabrese and A. Cappi and D. Di Ferdinando and J. A. Escartin Vigo and L. Gabarra and J. Martín-Fleitas and S. Matthew and M. Maturi and N. Mauri and R. B. Metcalf and A. A. Nucita and M. Pöntinen and I. Risso and V. Scottez and M. Sereno and M. Tenti and M. Viel and M. Wiesmann and Y. Akrami and I. T. Andika and S. Anselmi and M. Archidiacono and F. Atrio-Barandela and A. Balaguera-Antolinez and D. Bertacca and M. Bethermin and L. Blot and H. Böhringer and S. Borgani and M. L. Brown and S. Bruton and A. Calabro and F. Caro and C. S. Carvalho and T. Castro and F. Cogato and S. Conseil and S. Contarini and A. R. Cooray and O. Cucciati and S. Davini and F. De Paolis and G. Desprez and A. Díaz-Sánchez and J. J. Diaz and S. Di Domizio and J. M. Diego and P. Dimauro and A. Enia and Y. Fang and A. G. Ferrari and P. G. Ferreira and A. Finoguenov and A. Franco and K. Ganga and J. García-Bellido and T. Gasparetto and V. Gautard and E. Gaztanaga and F. Giacomini and F. Gianotti and G. Gozaliasl and C. M. Gutierrez and C. Hernández-Monteagudo and H. Hildebrandt and J. Hjorth and S. Joudaki and J. J. E. Kajava and Y. Kang and V. Kansal and D. Karagiannis and K. Kiiveri and C. C. Kirkpatrick and S. Kruk and M. Lattanzi and L. Legrand and M. Lembo and F. Lepori and G. Leroy and G. F. Lesci and J. Lesgourgues and L. Leuzzi and T. I. Liaudat and A. Loureiro and J. Macias-Perez and G. Maggio and M. Magliocchetti and F. Mannucci and R. Maoli and C. J. A. P. Martins and L. Maurin and M. Miluzio and P. Monaco and G. Morgante and S. Nadathur and K. Naidoo and A. Navarro-Alsina and S. Nesseris and L. Pagano and F. Passalacqua and K. Paterson and L. Patrizii and A. Pisani and D. Potter and S. Quai and M. Radovich and P. Reimberg and P. -F. Rocci and G. Rodighiero and S. Sacquegna and M. Sahlén and D. B. Sanders and A. Schneider and D. Sciotti and E. Sellentin and L. C. Smith and J. G. Sorce and K. Tanidis and C. Tao and G. Testera and R. Teyssier and S. Tosi and A. Troja and M. Tucci and C. Valieri and A. Venhola and D. Vergani and F. Vernizzi and G. Verza and P. Vielzeuf and N. A. Walton},
journal= {arXiv preprint arXiv:2506.22257},
year = {2026}
}
备注
21 pages, 11 figures