利用 DES Y1、SPT 与 Planck 的宇宙学透镜比率
宇宙学与河外天体物理
2019-07-26 v2
摘要
物质密度场示踪物与引力透镜之间的相关性对物质功率谱和宇宙膨胀率随宇宙时间的演化十分敏感。另一方面，此类相关函数的适当定义的比率仅依赖于到示踪天体和引力透镜源平面的角直径距离。由于其简单的宇宙学依赖性，此类比率可利用可用的信噪比直至小角尺度，即使在直接建模相关函数困难的情况下也是如此。我们展示了使用来自暗能量巡天（Dark Energy Survey）的星系位置与透镜数据，以及来自南极望远镜（South Pole Telescope）和 Planck 的 CMB 透镜数据进行的透镜比率测量，获得了迄今为止精度最高的透镜比率测量。相对于共识 CDM 模型，我们发现透镜比率振幅的最佳拟合为 。我们利用该比率测量生成宇宙学约束，聚焦于曲率参数。我们证明了测光选星系可用于测量透镜比率，并论证未来结合 LSST 与第 4 阶段 CMB 实验数据的透镜比率测量可用于给出有意义的宇宙学约束，即使在考虑了与测红移和星系剪切估计相关的系统不确定性之后。
引用
@article{arxiv.1810.02212,
title = {Cosmological lensing ratios with DES Y1, SPT and Planck},
author = {J. Prat and E. J. Baxter and T. Shin and C. Sánchez and C. Chang and B. Jain and R. Miquel and A. Alarcon and D. Bacon and G. M. Bernstein and R. Cawthon and T. M. Crawford and C. Davis and J. De Vicente and S. Dodelson and T. F. Eifler and O. Friedrich and M. Gatti and D. Gruen and W. G. Hartley and G. P. Holder and B. Hoyle and M. Jarvis and E. Krause and N. MacCrann and B. Mawdsley and A. Nicola and Y. Omori and A. Pujol and M. M. Rau and C. L. Reichardt and S. Samuroff and E. Sheldon and M. A. Troxel and P. Vielzeuf and J. Zuntz and T. M. C. Abbott and F. B. Abdalla and J. Annis and S. Avila and K. Aylor and B. A. Benson and E. Bertin and L. E. Bleem and D. Brooks and D. L. Burke and J. E. Carlstrom and M. Carrasco Kind and J. Carretero and C. L. Chang and H-M. Cho and R. Chown and A. T. Crites and C. E. Cunha and L. N. da Costa and S. Desai and H. T. Diehl and J. P. Dietrich and M. A. Dobbs and P. Doel and W. B. Everett and A. E. Evrard and B. Flaugher and P. Fosalba and J. García-Bellido and E. Gaztanaga and E. M. George and D. W. Gerdes and T. Giannantonio and R. A. Gruendl and J. Gschwend and G. Gutierrez and T. de Haan and N. W. Halverson and N. L. Harrington and W. L. Holzapfel and K. Honscheid and Z. Hou and J. D. Hrubes and D. J. James and T. Jeltema and L. Knox and R. Kron and K. Kuehn and N. Kuropatkin and O. Lahav and A. T. Lee and E. M. Leitch and M. Lima and D. Luong-Van and M. A. G. Maia and A. Manzotti and D. P. Marrone and J. L. Marshall and J. J. McMahon and P. Melchior and F. Menanteau and S. S. Meyer and C. J. Miller and L. M. Mocanu and J. J. Mohr and T. Natoli and S. Padin and A. A. Plazas and C. Pryke and A. K. Romer and A. Roodman and J. E. Ruhl and E. S. Rykoff and E. Sanchez and J. T. Sayre and V. Scarpine and K. K. Schaffer and S. Serrano and I. Sevilla-Noarbe and E. Shirokoff and G. Simard and M. Smith and M. Soares-Santos and F. Sobreira and Z. Staniszewski and A. A. Stark and K. T. Story and E. Suchyta and M. E. C. Swanson and G. Tarle and D. Thomas and K. Vanderlinde and J. D. Vieira and V. Vikram and A. R. Walker and J. Weller and R. Williamson and O. Zahn},
journal= {arXiv preprint arXiv:1810.02212},
year = {2019}
}
备注
17 pages, 11 figures