BICEP/Keck XXI：基于多倍率相关偏振性对早晴宇宙奇偶性违反的约束
宇宙学与河外天体物理
2026-03-10 v1
摘要
我们首次提出了利用 BK18 数据集对多倍率相关 cosmic birefringence（宇宙偏振双折射）进行约束。该数据集融合了 BICEP2、Keck Array 和 BICEP3 在 95、150 和 220 GHz 频率的观测数据。光子与类似轴子场的耦合会导致 CMB 偏振旋转，从而诱导出非零的 EB 交叉相关。我们表明，多倍率相关旋转 在偏振谱中留下独特的特征，可被约束。具体而言，我们考虑一种早期暗能量（Early Dark Energy, EDE）情景，其中准标量场通过 Chern-Simons 相互作用与光子耦合，产生具有多倍率依赖性的偏振旋转。我们引入一种作为阶梯函数的现象学 ，得到该阶梯函数大小的约束（与零一致），其不确定性小于 0.15 度（68% 置信区间）。此外，利用多频率的 EE、BB 和 EB 交叉谱，结合稳健的 BICEP/Keck 前景处理和似然框架，我们对轴子-光子耦合强度 进行约束。对于基于 Planck 2018 分析的最佳拟合值 ，我们得到 （68% 置信区间），与先前的限制相符。
引用
@article{arxiv.2603.06812,
title = {BICEP/Keck XXI: Constraints on Early-Universe Parity Violation from Multipole-Dependent Birefringence},
author = {Keck Collaboration and P. A. R. Ade and Zeeshan Ahmed and Mandana Amiri and Denis Barkats and Ritoban Basu Thakur and Colin A. Bischoff and Dominic Beck and James J. Bock and Hans Boenish and Victor Buza and Brianna Cantrall and James R. Cheshire and Jake Connors and James Cornelison and Michael Crumrine and Ari Jozef Cukierman and Edward Denison and Lionel Duband and Michael Echter and Miranda Eiben and Brodi D. Elwood and Sofia Fatigoni and Jeffrey P. Filippini and Antonio Fortes and Min Gao and Christos Giannakopoulos and Neil Goeckner-Wald and David C. Goldfinger and Stephen Gratton and James A. Grayson and Annsley Greathouse and Paul K. Grimes and Grantland Hall and George Halal and Mark Halpern and Emma Hand and Sam A. Harrison and Shawn Henderson and Thuong Hoang and Johannes Hubmayr and Howard Hui and Kent D. Irwin and Jae Hwan Kang and Kirit S. Karkare and Sinan Kefeli and J. M. Kovac and Chao-Lin Kuo and Kekoa Lasko and King Lau and Margaret Lautzenhiser and Amber Lennox and Tongtian Liu and Scott Mackey and Nolan Maher and Koko G. Megerian and Lorenzo Minutolo and Lorenzo Moncelsi and Yuka Nakato and H. T. Nguyen and Roger O'Brient and Scott Paine and Anika Patel and Matthew A. Petroff and Anna R. Polish and Thomas Prouve and Clement Pryke and Carl D. Reintsema and Steffen Richter and Thibault Romand and Maria Salatino and Alessandro Schillaci and Benjamin Schmitt and Robert Schwarz and Chris D. Sheehy and Baibhav Singari and Ahmed Soliman and Tyler St Germaine and Aaron Steiger and Bryan Steinbach and Rashmi Sudiwala and Grant Teply and Keith L. Thompson and Carole Tucker and Anthony D. Turner and Clara Vergès and Abigail G. Vieregg and Albert Wandui and Alexis C. Weber and Justin Willmert and Chin Lin Wong and Wai Ling K. Wu and Hung-I Yang and Cyndia Yu and Lingzhen Zeng and Cheng Zhang and Silvia Zhang},
journal= {arXiv preprint arXiv:2603.06812},
year = {2026}
}
备注
19 pages, 9 figures, 9 tables