论文标题
普朗克公共版本4的宇宙双折射
Cosmic Birefringence from Planck Public Release 4
论文作者
论文摘要
我们使用公共发行版4（pr4或$ \ mathtt {npipe} $）中的普朗克极化数据在宇宙微波背景下搜索奇偶校验物理的签名。对于几乎全天的数据，我们最初找到一个双重角度$β= 0.30^\ circ \ pm0.11^\ circ $（$ 68 \％$ 〜c.l。）。我们还发现，$β$的值随着我们扩大银河面膜的变化而降低，这可以解释为极化前景发射的效果。我们使用两种独立的方法来建模这种效果，并减轻其对$β$的影响。尽管结果是有希望的，并且两种模型之间的良好一致性令人鼓舞，但在我们提高对前景极化的知识之前，我们不会为$β$的测量值分配宇宙学意义。认识到极化角度的误解并不是唯一可以产生虚假的TB和EB相关性的工具性系统性，我们还对$ \ Mathtt {nPipe} $端到端模拟进行了详细的研究，以证明我们的$β$的测量结果不会受到任何已知系统的影响。
We search for the signature of parity-violating physics in the Cosmic Microwave Background using Planck polarization data from the Public Release 4 (PR4 or $\mathtt{NPIPE}$). For nearly full-sky data, we initially find a birefringence angle $β=0.30^\circ\pm0.11^\circ$ ($68\%$~C.L.). We also find that the values of $β$ decrease as we enlarge the Galactic mask, which can be interpreted as the effect of polarized foreground emission. We use two independent approaches to model this effect and mitigate its impact on $β$. Although results are promising, and the good agreement between both models is encouraging, we do not assign cosmological significance to the measured value of $β$ until we improve our knowledge of the foreground polarization. Acknowledging that the miscalibration of polarization angles is not the only instrumental systematic that can create spurious TB and EB correlations, we also perform a detailed study of $\mathtt{NPIPE}$ end-to-end simulations to prove that our measurements of $β$ are not significantly affected by any of the known systematics.
