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The features of a hypothetical 4ν interaction considered as the possible reason for massive-neutrino instability required in the cosmological scenario that involve neutrino dark matter are discussed. New constraints on the 4ν-interaction constant G χ are obtained: G χG Z (G F is the Fermi constant of weak interaction; m χ is the mass of the 4ν-interaction gauge boson, also known as χ boson; and m Z is the Z-boson mass) and G χ<(2.8–5.6)G F for m χ≪G Z . These constraints virtually rule out the 4ν interaction as a possible version of solution to the cosmological neutrino-instability problem.
Belotsky et al. (Sat,) studied this question.
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