Euclid：非线性处方对弱引力透镜宇宙剪切宇宙学参数估计的影响
宇宙学与河外天体物理
2021-05-26 v1
摘要
即将开展的巡天将以前所未有的精度绘制大尺度结构的增长，增进我们对宇宙暗成分的理解。遗憾的是，大部分宇宙学信息编码于小尺度上，而暗物质的成团性以及天体物理反馈过程的影响尚未被完全理解。这会使宇宙学参数的估计产生偏差，我们在本文中针对模拟的 Euclid 宇宙剪切与 Planck 宇宙微波背景数据的联合分析研究了这一问题。我们对小尺度信号的建模采用了不同实现方式，发现它们导致显著不同的预言。此外，不同的非线性修正会引起有偏的参数估计，尤其是当分析扩展至高度非线性 regime 时，受冲击最大的是哈勃常数 与成团振幅 。因此，若要以更多更优的数据解决当前的张力，就需要改进非线性尺度的建模。对于给定的非线性功率谱处方，对重子物理使用不同的修正并不会显著影响 Euclid 的精度，但忽略这些修正确实会导致宇宙学参数的大幅偏差。因此，要从 Euclid 宇宙剪切数据中提取精确且无偏的宇宙学参数约束，必须提高刻画非线性结构形成之方法的准确性，以及重子再分布的天体物理过程影响的建模精度。
引用
@article{arxiv.2010.12382,
title = {Euclid: impact of nonlinear prescriptions on cosmological parameter estimation from weak lensing cosmic shear},
author = {M. Martinelli and I. Tutusaus and M. Archidiacono and S. Camera and V. F. Cardone and S. Clesse and S. Casas and L. Casarini and D. F. Mota and H. Hoekstra and C. Carbone and S. Ilić and T. D. Kitching and V. Pettorino and A. Pourtsidou and Z. Sakr and D. Sapone and N. Auricchio and A. Balestra and A. Boucaud and E. Branchini and M. Brescia and V. Capobianco and J. Carretero and M. Castellano and S. Cavuoti and A. Cimatti and R. Cledassou and G. Congedo and C. Conselice and L. Conversi and L. Corcione and A. Costille and M. Douspis and F. Dubath and S. Dusini and G. Fabbian and P. Fosalba and M. Frailis and E. Franceschi and B. Gillis and C. Giocoli and F. Grupp and L. Guzzo and W. Holmes and F. Hormuth and K. Jahnke and S. Kermiche and A. Kiessling and M. Kilbinger and M. Kunz and H. Kurki-Suonio and S. Ligori and P. B. Lilje and I. Lloro and E. Maiorano and O. Marggraf and K. Markovic and R. Massey and M. Meneghetti and G. Meylan and B. Morin and L. Moscardini and S. Niemi and C. Padilla and S. Paltani and F. Pasian and K. Pedersen and S. Pires and G. Polenta and M. Poncet and L. Popa and F. Raison and J. Rhodes and M. Roncarelli and E. Rossetti and R. Saglia and P. Schneider and A. Secroun and S. Serrano and C. Sirignano and G. Sirri and J. -L. Starck and F. Sureau and A. N. Taylor and I. Tereno and R. Toledo-Moreo and E. A. Valentijn and L. Valenziano and T. Vassallo and Y. Wang and N. Welikala and A. Zacchei and J. Zoubian},
journal= {arXiv preprint arXiv:2010.12382},
year = {2021}
}
备注
18 pages, 6 figures. Prepared for submission to Astronomy & Astrophysics