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

摘要

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 ′ ～ O ( 10 ? ? eV ) and charged Higgses at a few 100?GeV. It requires hidden neutrinos with active-hidden mixing angles larger than 5 × 10 ? 4 and masses in the range 1 ÷ 300 ? ? eV , which could also play a role for short baseline neutrino oscillation anomalies.