利用DESI示踪物交叉相关约束局域原初非高斯性
宇宙学与河外天体物理
2026-04-08 v1
摘要
我们通过DESI DR1示踪物的自相关和交叉相关的联合分析来约束局域原初非高斯性，利用LRGs和QSOs以及ELGs（红移0.8<z<3.1）。通过在相同红移范围内不同聚类示踪物之间交叉验证信号，我们评估f^N_L测量中的潜在系统误差，利用交叉相关对非共同系统误差的较低敏感性。我们发现LRG和类星体之间的交叉相关可以稳健地改善DESI DR1的f^N_L约束，在68%置信水平下测量值改善约9%，达到f^N_L=2.1_{-8.3}^{+8.8}。另一方面，将DESI DR1 ELG样本纳入后未发现明显改善。模拟测试预测额外约8%的增益及统计散射，数据中未观察到改善与此预期一致。本项目作为DESI ELG聚类用于f^N_L的探索性分析，通过其交叉相关为未来的DESI数据分析做准备。
引用
@article{arxiv.2604.05213,
title = {Local primordial non-Gaussianity using cross-correlations of DESI tracers},
author = {A. J. Rosado-Marín and A. J. Ross and H. Seo and E. Chaussidon and J. Aguilar and S. Ahlen and D. Bianchi and D. Brooks and T. Claybaugh and A. Cuceu and A. de la Macorra and A. de Mattia and R. Demina and B. Dey and P. Doel and S. Ferraro and A. Font-Ribera and J. E. Forero-Romero and E. Gaztañaga and S. Gontcho A Gontcho and G. Gutierrez and C. Hahn and H. K. Herrera-Alcantar and D. Huterer and M. Ishak and R. Joyce and D. Kirkby and A. Kremin and O. Lahav and C. Lamman and M. Landriau and M. E. Levi and M. Manera and A. Meisner and R. Miquel and S. Nadathur and J. A. Newman and N. Palanque-Delabrouille and W. J. Percival and F. Prada and I. Pérez-Ràfols and G. Rossi and E. Sanchez and D. Schlegel and J. Silber and G. Tarlé and B. A. Weaver and C. Zhao and H. Zou},
journal= {arXiv preprint arXiv:2604.05213},
year = {2026}
}
备注
26 pages, 6 figures, 7 tables