Dark sector interaction and the supernova absolute magnitude tension

TL;DR

This paper investigates whether dark sector interactions can resolve the supernova absolute magnitude tension by constraining $M_B$ with observational data across different cosmological models.

Contribution

It introduces and tests an interacting dark energy-dark matter model as a solution to the supernova $M_B$ tension, using comprehensive observational constraints.

Findings

The IDE model can resolve the $M_B$ tension with a non-zero coupling at 95% CL.

The study confirms the potential of dark sector interactions to address supernova magnitude discrepancies.

Results support the idea that modifications in dark sector dynamics can alleviate cosmological tensions.

Abstract

It has been intensively discussed if modifications in the dynamics of the Universe at late times is able or not to solve the $H_0$ tension. On the other hand, it has also been argued that the $H_0$ tension is actually a tension on the supernova absolute magnitude $M_B$. In this work, we robustly constraint $M_B$ using Pantheon Supernovae Ia (SN) sample, Baryon Acoustic Oscillations (BAO), and Big Bang Nucleosynthesis (BBN) data, and assess the $M_B$ tension by comparing three theoretical models, namely the standard $\Lambda$CDM, the $w$CDM and a non-gravitational interaction (IDE) between dark energy (DE) and dark matter (DM). We find that the IDE model can solve the $M_B$ tension with a coupling different from zero at 95\% CL, confirming the results obtained using a $H_0$ prior.