Formation of structure in a universe with unstable neutrinos

Possible influence of the instability of massive neutrinos relative to decays |$\nu_\text H\rightarrow\nu_\text L+\mu(f)$| with μ(f) majoron (familon) on the processes of the formation of the structure of the Universe is discussed. It is shown that it is possible to decrease the density of neutrino ‘pancakes’ by 10–20 times as compared to the standard model. It makes possible: (1) the stopping of the process of decay of the structure and thus it makes compatible the formation of first objects at z ≃ 4.5 with the existence of evolved structure at z ≃ 0, (2) a compatibility of the predicted and observed value of the density of the hidden mass, and (3) a better compatibility of the predicted and the observed correlation function. It is possible in some models to decrease by 5–10 times the predicted value of the amplitude of large-scale thermal background fluctuations.

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