Dark sector interaction and the supernova absolute magnitude tension
Abstract
It has been intensively discussed if modifications in the dynamics of the Universe at late times is able or not to solve the H0 tension. On the other hand, it has also been argued that the H0 tension is actually a tension on the supernova absolute magnitude MB. In this work, we robustly constraint MB using Pantheon Supernovae Ia (SN) sample, Baryon Acoustic Oscillations (BAO), and Big Bang Nucleosynthesis (BBN) data, and assess the MB tension by comparing three theoretical models, namely the standard , the wCDM and a non-gravitational interaction (IDE) between dark energy (DE) and dark matter (DM). We find that the IDE model can solve the MB tension with a coupling different from zero at 95\% CL, confirming the results obtained using a H0 prior.