Is there evidence for CIDER in the Universe?

In this work we analyze the full linear behaviour of the constrained interacting dark energy (CIDER) model, which is a conformally coupled quintessence model tailored to mimic a \(\Lambda\)CDM expansion. We compute the matter and temperature anisotropies power spectra and test the model against rece...

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Published in:arXiv.org 2023-01
Main Authors: Barros, Bruno J, Castelão, Diogo, Vitor da Fonseca, Barreiro, Tiago, Nunes, Nelson J, Tereno, Ismael
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Cider
Dark energy
Perturbation
Power spectra
Quintessence (cosmology)
Universe
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Castelão, Diogo
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Barreiro, Tiago
Nunes, Nelson J
Tereno, Ismael
description In this work we analyze the full linear behaviour of the constrained interacting dark energy (CIDER) model, which is a conformally coupled quintessence model tailored to mimic a \(\Lambda\)CDM expansion. We compute the matter and temperature anisotropies power spectra and test the model against recent observational data. We shed light on some particular subtleties of the background behaviour that were not fully captured in previous works, and study the physics of the linear cosmological observables. One novelty found was that matter perturbations are enhanced at large scales when compared with the ones of the standard \(\Lambda\)CDM. The reason and impact of this trend on the cosmological observables and on the physics of the early Universe are considered. We find that the introduction of the coupling parameter alleviates the \(\sigma_8\) tension between early and late time probes although Planck data favours the \(\Lambda\)CDM limit of the model.
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subjects Cider
Dark energy
Perturbation
Power spectra
Quintessence (cosmology)
Universe
title Is there evidence for CIDER in the Universe?
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