暗能量探测器第六年结果：基于宇宙剪切的宇宙学约束
宇宙学与河外天体物理
2026-02-11 v1
摘要
本文提出了使用暗能量探测器（Dark Energy Survey）六年 imaging 数据所得的历史性宇宙剪切测量与宇宙学约束。从这些数据中，我们研究了约1.4亿颗星系（每平方分弧分钟8.29颗星系），这些星系在i=24.0处50%完整，延伸至z>1.2。我们将星系分为四个红移区间，获得的宇宙剪切测量信噪比为83，为第3代分析的2倍。我们对剪切和红移校准的不确定性进行建模，并在小角尺度处丢弃测量，以缓解质子反馈和其他小尺度不确定性。我们考虑两种 fiducial 模型来 accounts for星系的本体错位（IA）。我们在 CDM 模型下进行盲分析，发现 （边际化均值，68%置信区间）when使用非线性错位模型（NLA），以及 with潮汐错位和潮汐扭矩模型（TATT），分别在 上提供1.8%和2.5%不确定性。与来自普朗克2018年、ACT DR6和SPT-3G DR1的宇宙微波背景约束相比，我们在完整参数空间中以1.1（1.7）和在 中以2.0（2.3）的NLA（TATT）下保持一致。根据贝叶斯证据，NLA模型的结果更受偏好。我们发现，IA和质子反馈的模型选择可能导致我们的 约束产生最多 的变化。对于我们的 fiducial 模型选择，结果 的不确定性主要由尺度的删除以及对IA参数的边际化所致。我们表明，结果在内部是一致的，并且对不同的校准方法选择具有鲁棒性，归功于剪切和红移测量方法的改进，为下一代宇宙剪切项目奠定了基础。
引用
@article{arxiv.2602.10065,
title = {Dark Energy Survey Year 6 Results: Cosmological Constraints from Cosmic Shear},
author = {DES Collaboration and T. M. C. Abbott and M. Aguena and A. Alarcon and O. Alves and A. Amon and D. Anbajagane and F. Andrade-Oliveira and W. d'Assignies and S. Avila and D. Bacon and J. Beas-Gonzalez and K. Bechtol and M. R. Becker and G. M. Bernstein and J. Blazek and S. Bocquet and D. Brooks and H. Camacho and G. Camacho-Ciurana and R. Camilleri and G. Campailla and A. Campos and A. Carnero Rosell and M. Carrasco Kind and J. Carretero and F. J. Castander and R. Cawthon and C. Chang and A. Choi and J. M. Coloma-Nadal and C. Conselice and L. N. da Costa and M. Costanzi and M. Crocce and T. M. Davis and J. De Vicente and D. L. DePoy and J. DeRose and S. Desai and H. T. Diehl and P. Doel and C. Doux and A. Drlica-Wagner and T. F. Eifler and S. Everett and A. E. Evrard and A. Ferté and B. Flaugher and P. Fosalba and O. Friedrich and J. Frieman and J. García-Bellido and M. Gatti and G. Giannini and P. Giles and K. Glazebrook and D. Gruen and R. A. Gruendl and G. Gutierrez and I. Harrison and W. G. Hartley and K. Herner and S. R. Hinton and D. L. Hollowood and K. Honscheid and D. Huterer and B. Jain and D. J. James and M. Jarvis and N. Jeffrey and T. Jeltema and T. Kacprzak and S. Kent and E. Krause and O. Lahav and S. Lee and E. Legnani and H. Lin and J. L. Marshall and S. Mau and J. Mena-Fernández and F. Menanteau and R. Miquel and J. J. Mohr and J. Muir and J. Myles and R. C. Nichol and R. L. C. Ogando and A. Palmese and M. Paterno and W. J. Percival and D. Petravick and A. A. Plazas Malagón and A. Porredon and J. Prat and C. Preston and M. Raveri and M. Rodriguez-Monroy and A. K. Romer and A. Roodman and E. S. Rykoff and S. Samuroff and C. Sánchez and E. Sanchez and D. Sanchez Cid and T. Schutt and I. Sevilla-Noarbe and E. Sheldon and T. Shin and M. E. da Silva Pereira and M. Smith and M. Soares-Santos and E. Suchyta and M. E. C. Swanson and M. Tabbutt and G. Tarle and D. Thomas and C. To and M. A. Troxel and V. Vikram and M. Vincenzi and N. Weaverdyck and J. Weller and P. Wiseman and M. Yamamoto and B. Yanny and B. Yin and J. Zuntz},
journal= {arXiv preprint arXiv:2602.10065},
year = {2026}
}
备注
See this https://www.darkenergysurvey.org/des-y6-cosmology-results-papers/ for the full DES Y6 3x2pt cosmology release