Abstract
Abstract
This paper aims to perform a phenomenological parametrisation of the standard cosmological
model, ΛCDM, 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 ΛCDM 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 ΛCDM model, and
the largest improvements were obtained for the models that include the lensing parameter, AL
.
Subject
Astronomy and Astrophysics
Cited by
1 articles.
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