Is there evidence for CIDER in the Universe?

Understand

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.