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arXiv · 2004.13039

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

Maximilian Berbig·Sudip Jana·Andreas Trautner
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Abstract

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 $m_{Z'}\sim\mathcal{O}(10~\mathrm{eV})$ and charged Higgses at a few $100~\mathrm{GeV}$. It requires hidden neutrinos with active-hidden mixing angles larger than $5\times10^{-4}$ and masses in the range $1\div300\mathrm{eV}$, which could also play a role for short baseline neutrino oscillation anomalies.

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Maximilian Berbig, Sudip Jana, Andreas Trautner. 2020-04-27. The Hubble tension and a renormalizable model of gauged neutrino self-interactions. https://doi.org/10.1103/physrevd.102.115008

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