Constraining CMB physical processes using Planck 2018 data

M. Ruiz-Granda

doi:10.1088/1475-7516/2022/11/043

2022-11-18

M. Ruiz-Granda *

P. Vielva

DOI：10.1088/1475-7516/2022/11/043

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摘要

En 中文

This paper aims to perform a phenomenological parametrisation of the standard cosmological model, Lambda 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 Lambda 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 Lambda CDM model, and the largest improvements were obtained for the models that include the lensing parameter, A(L).

Keyword:

CMBR polarisation

cosmological parameters from CMBR

integrated Sachs-Wolfe effect

physics of the early universe

期刊

Journal of Cosmology and Astroparticle Physics

IF:

5.9

论文数:

1.3W

被引数:

4.7W

机构

consejo superior de investigaciones cientificas (csic)

学者数:

8.8W

论文数: 8.5W

被引数: 125

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