Majorana neutrinos convert to antineutrinos in ultralight vector dark matter backgrounds coupled to lepton number, enabling supernova neutrino detectors to probe gauge couplings as small as 10^{-32} for masses around 10^{-22} to 10^{-14} eV.
We take the Hamiltonian for a neutrino traveling along the +zdirection to beH=V(t)·σ, whereVis a time-dependent three-vector
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Neutrino-Antineutrino Conversion from Ultralight Vector Dark Matter
Majorana neutrinos convert to antineutrinos in ultralight vector dark matter backgrounds coupled to lepton number, enabling supernova neutrino detectors to probe gauge couplings as small as 10^{-32} for masses around 10^{-22} to 10^{-14} eV.