论文标题
在银河前景和仪器系统效果的情况下表征宇宙双折射
Characterising cosmic birefringence in the presence of galactic foregrounds and instrumental systematic effects
论文作者
论文摘要
我们研究了在存在极化角度误解的情况下，在宇宙微波背景极化数据的帮助下，在不依赖于银河前景角功率光谱，尤其是其EB相关性的任何假设的情况下，借助宇宙微波背景极化数据来限制了各向同性宇宙双折射的可能性。我们提出了一个基于广义参数组件分离方法的新分析框架，该框架同时考虑了银河前景，相关仪器效应和外部先验。我们发现，即将进行适当校准先验的即将到来的多频CMB数据将允许生产具有仪器效果校正和前景清洁的CMB图，该图可用于估计在统计和系统的不正确的过程中，该过程会估算各向异性双发性双向范围和张量比比率。特别是，在类似于西蒙斯的观测台的情况下，三个小孔径望远镜，我们在$σ（β_{b}）= 0.07^\ circ $（0.1 $^\ circ $）上的双重偏双角度的不确定性（假设所有标准的体积和校准频率）（单个单个频率）（单个单个频率） 0.1^\ circ $，涉及不久的将来的基于地面的实验。这意味着这些实验可以确认或反驳最近检测到的$β_b= 0.35^\ circ $的值，其显着性在$ 3 $和5σ$之间。 [删节版本]
We study a possibility of constraining isotropic cosmic birefringence with help of cosmic microwave background polarisation data in the presence of polarisation angle miscalibration without relying on any assumptions about the Galactic foreground angular power spectra and in particular on their EB correlation. We propose a new analysis framework based on a generalised parametric component separation approach, which accounts simultaneously on the presence of galactic foregrounds, relevant instrumental effects and external priors. We find that upcoming multi-frequency CMB data with appropriate calibration priors will allow producing an instrumental-effect-corrected and foreground-cleaned CMB map, which can be used to estimate the isotropic birefringence angle and the tensor-to-scalar ratio, accounting on statistical and systematic uncertainties incurred during the entire procedure. In particular, in the case of a Simons Observatory-like, three Small Aperture Telescopes, we derive an uncertainty on the birefringence angle of $σ(β_{b}) = 0.07^\circ$ (0.1$^\circ$), assuming the standard cosmology and calibration priors for all (single) frequency channels with the precision of $σ(α_i)= 0.1^\circ$ as aimed at by the near future ground-based experiments. This implies that these experiments could confirm or disprove the recently detected value of $β_b=0.35^\circ$ with a significance between $3$ and $5 σ$. [abridged version]
