Proca in the sky

The standard model of cosmology, the Lambda CDM model, describes the evolution of the Universe since the Big Bang with just a few parameters, six in its basic form. Despite being the simplest model, direct late-time measurements of the Hubble constant compared with the early-universe measurements result in the so-called H-0 tension. It is claimed that a late time resolution is predestined to fail when different cosmological probes are combined. In this work, we shake the ground of this belief with a very simple model. We show how, in the context of cubic vector Galileon models, the Hubble tension can naturally be relieved using a combination of CMB, BAO and SNe observations without using any prior on H-0. The tension can be reduced even further by including the local measurement of the Hubble constant.

Automated summary

The ΛCDM model describes the evolution of the Universe since the Big Bang, but discrepancies between late-time and early-universe measurements of the Hubble constant result in the H-0 tension. This work shows how a combination of new models and observational data can help alleviate this tension.