暗能量巡天第三年结果:利用离散实现的排序对红移分布不确定性进行边际化
宇宙学与河外天体物理
2022-02-09 v2
摘要
弱引力透镜巡天的宇宙学信息通过将源星系划分为层析子样本并估计其红移分布而最大化。这些红移分布的不确定性必须正确传播到宇宙学结果中。我们提出hyperrank,一种在宇宙学分析中边际化红移分布不确定性的新方法,使用来自所有可能红移分布空间的离散样本。与先前高度简化的红移分布不确定性参数模型相比,本文展示了该方法。在hyperrank中,所提出的红移分布集合根据少量(本工作中为一至四个)汇总值进行排序,这些汇总值随后与其他 nuisance 参数和宇宙学参数一起在用于推断的蒙特卡洛链中采样。这可视为一种边际化具有 nuisance 参数的数据矢量变化的离散实现的通用方法,因此可独立于主要感兴趣的参数进行采样,从而提高计算效率。我们聚焦于弱引力透镜宇宙剪切分析的情形,并利用为暗能量巡天(DES)制作的模拟演示了该方法。我们表明该方法能正确且高效地边际化一系列红移分布不确定性模型。最后,我们将hyperrank与常见的边际化红移不确定性的均值偏移方法进行比较,验证了这一更简单的模型足以用于配套论文中给出的DES第三年宇宙学结果。
引用
@article{arxiv.2109.09636,
title = {Dark Energy Survey Year 3 results: Marginalisation over redshift distribution uncertainties using ranking of discrete realisations},
author = {Juan P. Cordero and Ian Harrison and Richard P. Rollins and G. M. Bernstein and S. L. Bridle and A. Alarcon and O. Alves and A. Amon and F. Andrade-Oliveira and H. Camacho and A. Campos and A. Choi and J. DeRose and S. Dodelson and K. Eckert and T. F. Eifler and S. Everett and X. Fang and O. Friedrich and D. Gruen and R. A. Gruendl and W. G. Hartley and E. M. Huff and E. Krause and N. Kuropatkin and N. MacCrann and J. McCullough and J. Myles and S. Pandey and M. Raveri and R. Rosenfeld and E. S. Rykoff and C. Sánchez and J. Sánchez and I. Sevilla-Noarbe and E. Sheldon and M. Troxel and R. Wechsler and B. Yanny and B. Yin and Y. Zhang and M. Aguena and S. Allam and E. Bertin and D. Brooks and D. L. Burke and A. Carnero Rosell and M. Carrasco Kind and J. Carretero and F. J. Castander and R. Cawthon and M. Costanzi and L. da Costa and M. E. da Silva Pereira and J. De Vicente and H. T. Diehl and J. Dietrich and P. Doel and J. Elvin-Poole and I. Ferrero and B. Flaugher and P. Fosalba and J. Frieman and J. Garcia-Bellido and D. Gerdes and J. Gschwend and G. Gutierrez and S. Hinton and D. L. Hollowood and K. Honscheid and B. Hoyle and D. James and K. Kuehn and O. Lahav and M. A. G. Maia and M. March and F. Menanteau and R. Miquel and R. Morgan and J. Muir and A. Palmese and F. Paz-Chinchon and A. Pieres and A. Plazas Malagón and E. Sánchez and V. Scarpine and S. Serrano and M. Smith and M. Soares-Santos and E. Suchyta and M. Swanson and G. Tarle and D. Thomas and C. To and T. N. Varga},
journal= {arXiv preprint arXiv:2109.09636},
year = {2022}
}
备注
Accepted for publication in MNRAS. 17 pages, 12 figures, comments welcome Replacement: Added small comments suggested by referee