Hubble Tension as a Window on the Gravitation of the Dark Matter Sector

A simple and minimal extension of the standard cosmological Λ CDM model in which dark matter experiences an additional long-range scalar interaction is demonstrated to alleviate the long-lasting Hubble tension while primordial nucleosynthesis predictions remain unaffected and passing by construction all current local tests of general relativity. The theoretical formulation of this Λ β CDM model and its comparison to astrophysical observations are presented to prove its ability to fit existing data and potentially resolve the tension.