DESI DR1 全形态与 DR2 BAO 联合约束下的宇宙学分析
宇宙学与河外天体物理
2026-02-24 v1
摘要
我们提出一种结合暗能量光谱仪仪器 (DESI) DR1 全形态 (FS) 聚类测量与 DESI DR2 双声波振荡 (BAO) 测量的宇宙学分析。为实现鲁棒的联合处理，考虑两大数据释放之间的相关性，我们采用 ShapeFit 压缩方法，并使用 EZmocks 估计联合协方差。这种压缩方法本质上缓解了以往 DESI 数据在最小化外部先验约束下主导贝叶斯约束的体积效应。因此，我们首次在贝叶斯框架下获得仅依赖巨核素核合成 (BBN) 先验于基本谱指数宽先验的 DESI-only 约束。平坦 CDM 中，我们发现 ，，。对于 CDM 动力学暗能量模型，我们测得 ，，相较于等效 DR1 测量约改善 30%，并将与仅 BAO 分析相比的偏差降至 。我们还报告了对暗电子质和空间曲率的竞争性限制。本工作表明，ShapeFit 压缩为利用大尺度结构约束超 CDM 物理提供了一种先验稳健且计算高效的路径。
引用
@article{arxiv.2602.18761,
title = {Cosmological constraints from a joint DESI DR1 Full-Shape and DR2 BAO},
author = {D. Forero-Sánchez and H. Gil-Marín and L. Verde and Z. Ding and A. J. Ross and A. Carnero Rosell and J. Aguilar and S. Ahlen and S. Bailey and D. Bianchi and C. Blake and A. Brodzeller and D. Brooks and R. Canning and F. J. Castander and T. Claybaugh and S. Cole and A. Cuceu and A. de la Macorra and Arjun Dey and P. Doel and S. Ferraro and A. Font-Ribera and J. E. Forero-Romero and E. Gaztañaga and G. Gutierrez and J. Guy and C. Hahn and H. K. Herrera-Alcantar and K. Honscheid and D. Huterer and M. Ishak and R. Joyce and S. Juneau and R. Kehoe and D. Kirkby and T. Kisner and J. Kneib and A. Kremin and O. Lahav and C. Lamman and M. Landriau and L. Le Guillou and M. Manera and A. Meisner and R. Miquel and J. Moustakas and G. Niz and N. Palanque-Delabrouille and W. J. Percival and F. Prada and I. Pérez-Ràfols and G. Rossi and E. Sanchez and E. F. Schlafly and D. Schlegel and H. Seo and J. Silber and D. Sprayberry and G. Tarlé and B. A. Weaver and C. Zhao and R. Zhou and H. Zou},
journal= {arXiv preprint arXiv:2602.18761},
year = {2026}
}
备注
35 pages, 14 figures, 5 tables, submitted to JCAP