Dark sector interaction and the supernova absolute magnitude tension

It has been intensively discussed if modifications in the dynamics of the Universe at late times are able or not able 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 constrain M-B using Pantheon supernovae Ia sample, baryon acoustic oscillations, and big bang nucleosynthesis data, and assess the M-B tension by comparing three theoretical models, namely the standard Lambda CDM, the wCDM, and a nongravitational interaction between dark energy (IDE) and dark matter. 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.

Automated summary

This study provides robust constraints on the supernova absolute magnitude MB using different data and models, confirming that a non-gravitational interaction between dark energy and dark matter (IDE model) can alleviate the tension on MB to a certain extent.