Interacting Dark Energy in a closed universe

TL;DR

This paper demonstrates that Interacting Dark Energy models can reconcile the apparent closed universe indicated by Planck data with low-redshift observations like Type Ia Supernovae, easing existing cosmological tensions.

Contribution

It introduces the idea that Interacting Dark Energy models can resolve discrepancies between CMB and supernova data in a closed universe scenario.

Findings

IDE models improve fit between Planck and supernova data

Relaxing flatness assumptions enhances cosmological model consistency

Broader data analyses are encouraged for better understanding

Abstract

Recent measurements of the Cosmic Microwave Anisotropies power spectra measured by the Planck satellite show a preference for a closed universe at more than $99 \%$ Confidence Level. Such a scenario is however in disagreement with several low redshift observables, including luminosity distances of Type Ia Supernovae. Here we show that Interacting Dark Energy (IDE) models can ease the discrepancies between Planck and Supernovae Ia data in a closed Universe. Therefore IDE cosmologies remain as very appealing scenarios, as they can provide the solution to a number of observational tensions in different fiducial cosmologies. The results presented here strongly favour broader analyses of cosmological data, and suggest that relaxing the usual flatness and vacuum energy assumptions can lead to a much better agreement among theory and observations.