欧几里得准备：利用光谱和测光样本的新多示踪剂方法改进宇宙学约束
宇宙学与河外天体物理
2024-10-02 v1
摘要
未来由欧几里得任务提供的数据将使我们更好地理解宇宙的宇宙历史。其性能的一个度量是暗能量的品质因数（FoM），通常用Fisher预测估计。之前估计的FoM考虑了欧几里得的两个主要探针，即光谱星系样本的三维成团，以及来自测光样本的所谓3x2pt信号（即弱透镜信号、星系成团及其互相关）。到目前为止，这两个探针被视为独立的。在本文中，我们引入了一个新的可观测量，即两个巡天中星系（角）两点相关函数的比值。对于相同的（归一化）选择函数，该可观测量不受采样噪声影响，其方差仅由泊松噪声控制。我们给出了欧几里得的预测，其中应用了这种多示踪剂方法，并且由于两个巡天将覆盖相同的天区，该方法特别相关。该方法允许利用光谱和测光样本的组合。当不考虑这个新可观测量与其他探针之间的相关性时，FoM以及其他宇宙学参数的约束获得了显著改善。对于通常研究的修正引力模型，即增长因子的γ参数化，这种好处更为明显。然而，不同探针之间的相关性被发现是显著的，因此实际增益不确定。我们提出了各种策略来规避这个问题，并仍然从新可观测量中提取有用信息。
引用
@article{arxiv.2404.12157,
title = {Euclid preparation. Improving cosmological constraints using a new multi-tracer method with the spectroscopic and photometric samples},
author = {Euclid Collaboration and F. Dournac and A. Blanchard and S. Ilić and B. Lamine and I. Tutusaus and A. Amara and S. Andreon and N. Auricchio and H. Aussel and M. Baldi and S. Bardelli and C. Bodendorf and D. Bonino and E. Branchini and S. Brau-Nogue and M. Brescia and J. Brinchmann and S. Camera and V. Capobianco and J. Carretero and S. Casas and M. Castellano and S. Cavuoti and A. Cimatti 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 A. M. Di Giorgio and J. Dinis and M. Douspis and F. Dubath and X. Dupac and S. Dusini and A. Ealet and M. Farina and S. Farrens and S. Ferriol and M. Frailis and E. Franceschi and S. Galeotta and W. Gillard and B. Gillis and C. Giocoli and B. R. Granett and A. Grazian and F. Grupp and S. V. H. Haugan and W. Holmes and I. Hook and F. Hormuth and A. Hornstrup and P. Hudelot and K. Jahnke and E. Keihänen and S. Kermiche and A. Kiessling and M. Kilbinger and B. Kubik and M. Kümmel and M. Kunz and H. Kurki-Suonio and S. Ligori and P. B. Lilje and V. Lindholm and I. Lloro and D. Maino and E. Maiorano and O. Mansutti and O. Marggraf and K. Markovic and N. Martinet and F. Marulli and R. Massey and S. Maurogordato and E. Medinaceli and S. Mei and Y. Mellier and M. Meneghetti and E. Merlin and G. Meylan and M. Moresco and L. Moscardini and E. Munari and S. -M. Niemi and J. W. Nightingale 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 L. Pozzetti and F. Raison and R. Rebolo and A. Renzi and J. Rhodes and G. Riccio and E. Romelli and M. Roncarelli and E. Rossetti and R. Saglia and D. Sapone and P. Schneider and A. Secroun and G. Seidel and M. Seiffert and S. Serrano and C. Sirignano and G. Sirri and L. Stanco and C. Surace and P. Tallada-Crespí and D. Tavagnacco and A. N. Taylor and I. Tereno and R. Toledo-Moreo and F. Torradeflot and E. A. Valentijn and L. Valenziano and T. Vassallo and A. Veropalumbo and Y. Wang and A. Zacchei and G. Zamorani and J. Zoubian and E. Zucca and A. Biviano and M. Bolzonella and A. Boucaud and E. Bozzo and C. Burigana and C. Colodro-Conde and G. De Lucia and D. Di Ferdinando and J. A. Escartin Vigo and R. Farinelli and J. Gracia-Carpio and G. Mainetti and M. Martinelli and N. Mauri and C. Neissner and Z. Sakr and V. Scottez and M. Tenti and M. Viel and M. Wiesmann and Y. Akrami and V. Allevato and S. Anselmi and C. Baccigalupi and A. Balaguera-Antolinez and M. Ballardini and L. Blot and S. Borgani and S. Bruton and R. Cabanac and A. Calabro and G. Canas-Herrera and A. Cappi and C. S. Carvalho and G. Castignani and T. Castro and K. C. Chambers and S. Contarini and A. R. Cooray and J. Coupon and S. Davini and B. De Caro and S. de la Torre and G. Desprez and A. Díaz-Sánchez and S. Di Domizio and H. Dole and S. Escoffier and A. G. Ferrari and P. G. Ferreira and I. Ferrero and F. Finelli and L. Gabarra and K. Ganga and J. García-Bellido and E. Gaztanaga and F. Giacomini and G. Gozaliasl and H. Hildebrandt and A. Jimenez Munoz and J. J. E. Kajava and V. Kansal and D. Karagiannis and C. C. Kirkpatrick and L. Legrand and G. Libet 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 S. Matthew and L. Maurin and R. B. Metcalf and M. Migliaccio and P. Monaco and C. Moretti and G. Morgante and S. Nadathur and Nicholas A. Walton and L. Patrizii and A. Pezzotta and M. Pöntinen and V. Popa and C. Porciani and D. Potter and I. Risso and P. -F. Rocci and M. Sahlén and A. G. Sánchez and J. A. Schewtschenko and A. Schneider and E. Sefusatti and M. Sereno and J. Steinwagner and N. Tessore and G. Testera and R. Teyssier and S. Toft and S. Tosi and A. Troja and M. Tucci and J. Valiviita and D. Vergani and G. Verza},
journal= {arXiv preprint arXiv:2404.12157},
year = {2024}
}
备注
16 pages, 7 figures, submitted to A&A