The Hubble tension and a renormalizable model of gauged neutrino self-interactions

We present a simple extension of the Standard Model that leads to renormalizable long-range vector-mediated neutrino self-interactions. This model can resolve the Hubble tension by delaying the onset of neutrino free-streaming during recombination, without conflicting with other measurements. The extended gauge, scalar, and neutrino sectors lead to observable signatures, including invisible Higgs and Z decays, thereby relating the Hubble tension to precision measurements at the LHC and future colliders. The model has a new neutrinophilic gauge boson with m(Z') similar to O(10 eV) and charged Higgses at a few 100 GeV. It requires hidden neutrinos with active-hidden mixing angles larger than 5 x 10(-4) and masses in the range 1 divided by 300 eV, which could also play a role for short baseline neutrino oscillation anomalies.