论文标题
Atacama Cosmology望远镜：删除功率光谱和参数
The Atacama Cosmology Telescope: Delensed Power Spectra and Parameters
论文作者
论文摘要
我们提出从删节的微波背景功率谱获得的LCDM宇宙参数约束。来自Atacama宇宙学望远镜（ACT）的DR4数据子集的镜头图用于撤销150和98 GHz观察到的ACT光谱中的透镜效应。在150 GHz时，我们以30％（TT），30％（EE），26％（TE）和20％（BB）的有效效率删除了透镜失真；这导致在8.7 Sigma（TT），5.1 Sigma（EE），2.6 Sigma（TE）和2.4 Sigma（BB）意义的删除作用的检测结果。标准LCDM模型非常适合150和98 GHz TT，EE和TE删除光谱的组合。我们还测量了拟合删节和镜头光谱时最佳拟合参数的变化；虽然这种转变并不能告知我们测量宇宙学参数的能力，但它确实提供了从最佳拟合参数，CMB功率谱中的镜头和重建的镜头图中推断出的镜头之间的三向一致性检查。与正确的模型拟合时，预计这种转移为零，因为镜头和删除光谱均来自同一天空区域。与LCDM模型拟合并在前景上边缘化时，我们发现宇宙学参数的转移与零一致。我们的结果表明，在标准宇宙学模型的框架内，微波背景的重力镜头在内部是一致的。
We present LCDM cosmological parameter constraints obtained from delensed microwave background power spectra. Lensing maps from a subset of DR4 data from the Atacama Cosmology Telescope (ACT) are used to undo the lensing effect in ACT spectra observed at 150 and 98 GHz. At 150 GHz, we remove the lensing distortion with an effective efficiency of 30% (TT), 30% (EE), 26% (TE) and 20% (BB); this results in detections of the delensing effect at 8.7 sigma (TT), 5.1 sigma (EE), 2.6 sigma (TE), and 2.4 sigma (BB) significance. The combination of 150 and 98 GHz TT, EE, and TE delensed spectra is well fit by a standard LCDM model. We also measure the shift in best-fit parameters when fitting delensed versus lensed spectra; while this shift does not inform our ability to measure cosmological parameters, it does provide a three-way consistency check among the lensing inferred from the best-fit parameters, the lensing in the CMB power spectrum, and the reconstructed lensing map. This shift is predicted to be zero when fitting with the correct model since both lensed and delensed spectra originate from the same region of sky. Fitting with a LCDM model and marginalizing over foregrounds, we find that the shift in cosmological parameters is consistent with zero. Our results show that gravitational lensing of the microwave background is internally consistent within the framework of the standard cosmological model.
