论文标题
使用Planck 2018数据来限制CMB物理过程
Constraining CMB physical processes using Planck 2018 data
论文作者
论文摘要
本文旨在对标准宇宙学模型$λ$ CDM进行现象学参数化，以权衡定义宇宙微波背景（CMB）各向异性角度功率光谱模式的不同物理过程。我们使用六个现象学振幅来说明萨克斯 - 沃尔夫，早期和晚期综合的萨克斯 - 沃尔夫，极化贡献，多普勒和镜头效应。为此，我们已经改编了Boltzmann类代码，并使用了Cobaya的Markov Chain Monte Carlo（MCMC）采样器来探索Planck 2018的可能性来限制宇宙学和现象学参数的不同组合。观察现象学幅度与$λ$ CDM模型的预测的平均值的偏差可能对解决现有的宇宙学紧张局势有用。首次使用Planck 2018温度，极化和透镜功率谱进行了对CMB物理过程的全面分析。在先前的工作中，仅使用TT数据来限制现象学幅度，但是，通过包括极化和镜头数据，我们发现对这些物理贡献的约束更加严格。此外，只有考虑到所有Planck 2018数据，仅在考虑TT数据时才会出现一些脱模效。因此，可以研究具有三个以上现象学幅度的模型，当仅使用温度功率谱时，这是过于刺激的。本文提出的结果表明，普朗克实验可以限制除晚期综合萨克斯 - 沃尔夫效应外的所有现象学振幅。没有发现$λ$ CDM型号的不一致之处，并且对于包括镜头参数，$ a_l $的型号获得了最大的改进。
This paper aims to perform a phenomenological parametrisation of the standard cosmological model, $Λ$CDM, to weigh the different physical processes that define the pattern of the angular power spectra of the Cosmic Microwave Background (CMB) anisotropies. We use six phenomenological amplitudes to account for the Sachs-Wolfe, early and late Integrated Sachs-Wolfe, polarization contribution, Doppler and lensing effects. To do so, we have adapted the CLASS Boltzmann code and used the Markov Chain Monte Carlo (MCMC) sampler of Cobaya to explore the Planck 2018 likelihood to constrain different combinations of cosmological and phenomenological parameters. Observing deviations of the mean values of the phenomenological amplitudes from the predictions of the $Λ$CDM model could be useful to resolve existing cosmological tensions. For the first time, a comprehensive analysis of the physical processes of the CMB has been performed using the Planck 2018 temperature, polarization and lensing power spectra. In a previous work, the phenomenological amplitudes were constrained using only the TT data, however, by including the polarization and lensing data we find that the constraints on these physical contributions are tighter. In addition, some degeneracies that appear only when considering TT data are completely broken by taking into account all Planck 2018 data. Consequently, models with more than three phenomenological amplitudes can be studied, which is prohibitive when only the temperature power spectrum is used. The results presented in this paper show that the Planck experiment can constrain all phenomenological amplitudes except the late Integrated Sachs-Wolfe effect. No inconsistencies were found with the $Λ$CDM model, and the largest improvements were obtained for the models that include the lensing parameter, $A_L$.
