基于ACT-DR4 CMB透镜与DES-Y3宇宙剪切交叉相关的宇宙学
宇宙学与河外天体物理
2024-09-17 v1
摘要
宇宙微波背景（CMB）弱透镜与星系弱透镜之间的交叉相关提供了一种对宇宙学与天体物理参数施加稳健约束的途径，且降低了对影响各单独巡天的某些系统效应的敏感性。我们测量了阿塔卡马宇宙学望远镜（ACT）DR4 CMB透镜与暗能量巡天（DES）Y3数据所测星系弱透镜之间的角交叉功率谱。我们的基线分析使用由ACT-DR4与数据导出的CMB收敛图，其中大部分由热Sunyaev Zel'dovich效应引起的污染已被去除，从而避免了交叉相关中的重要系统误差。在我们的建模中，我们考虑了测光不确定性、乘性剪切偏倚与星系内禀对齐等 nuisance 参数。所得交叉功率谱信噪比并通过一组零检验。我们借此在对该 nuisance 参数采用有信息但合理先验的条件下推断物质分布涨落幅度（）。我们还通过大幅放宽这些先验并检查所得后验的一致性来考察其有效性，发现它们一致，尽管仅具相对较弱的约束。该交叉相关测量将随新ACT-DR6透镜图显著改善，并构成DES与ACT间联合6x2pt分析的关键组分。
引用
@article{arxiv.2309.04412,
title = {Cosmology from Cross-Correlation of ACT-DR4 CMB Lensing and DES-Y3 Cosmic Shear},
author = {S. Shaikh and I. Harrison and A. van Engelen and G. A. Marques and T. M. C. Abbott and M. Aguena and O. Alves and A. Amon and R. An and D. Bacon and N. Battaglia and M. R. Becker and G. M. Bernstein and E. Bertin and J. Blazek and J. R. Bond and D. Brooks and D. L. Burke and E. Calabrese and A. Carnero Rosell and J. Carretero and R. Cawthon and C. Chang and R. Chen and A. Choi and S. K. Choi and L. N. da Costa and M. E. S. Pereira and O. Darwish and T. M. Davis and S. Desai and M. Devlin and H. T. Diehl and P. Doel and C. Doux and J. Elvin-Poole and G. S. Farren and S. Ferraro and I. Ferrero and A. Ferté and B. Flaugher and J. Frieman and M. Gatti and G. Giannini and S. Giardiello and D. Gruen and R. A. Gruendl and G. Gutierrez and J. C. Hill and S. R. Hinton and D. L. Hollowood and K. Honscheid and K. M. Huffenberger and D. Huterer and D. J. James and M. Jarvis and N. Jeffrey and H. T. Jense and K. Knowles and J. Kim and D. Kramer and O. Lahav and S. Lee and M. Lima and N. MacCrann and M. S. Madhavacheril and J. L. Marshall and J. McCullough and Y. Mehta and J. Mena-Fernández and R. Miquel and J. J. Mohr and K. Moodley and J. Myles and A. Navarro-Alsina and L. Newburgh and M. D. Niemack and Y. Omori and S. Pandey and B. Partridge and A. Pieres and A. A. Plazas Malagón and A. Porredon and J. Prat and F. J. Qu and N. Robertson and R. P. Rollins and A. Roodman and S. Samuroff and C. Sánchez and E. Sanchez and D. Sanchez Cid and L. F. Secco and N. Sehgal and E. Sheldon and B. D. Sherwin and T. Shin and C. Sifón M. Smith and E. Suchyta and M. E. C. Swanson and G. Tarle and M. A. Troxel and I. Tutusaus and C. Vargas and N. Weaverdyck and P. Wiseman and M. Yamamoto and J. Zuntz},
journal= {arXiv preprint arXiv:2309.04412},
year = {2024}
}
备注
26 pages, 30 figures (including appendices). Data associated with this article is available at https://github.com/itrharrison/actdr4kappa-x-desy3gamma-data