2023/06/16 by A. P. Serebrov, R. M. Samoilov, Serebrov, A. P. +4
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research
paper · pdf · doi:10.48550/arxiv.2306.09962
openalex publication_date 2023/06/16 · openalex created_date 2023/06/20 · openalex updated_date 2026/07/28
Joint analysis of the results of the Neutrino-4 experiment and the data of the GALLEX, SAGE and BEST experiments confirms the parameters of neutrino oscillations declared by the Neutrino-4 experiment (Δm142= 7.3 eV2 and sin2 2θ14 ≈ 0.36) and increases the confidence level to 5.8σ. Such a sterile neutrino thermalizes in cosmic plasma, contributes 5% to the energy density of the Universe, and can explain 15-20% of dark matter. It is discussed that the extension of the neutrino model by introducing two more heavy sterile neutrinos in accordance with the number of types of active neutrinos but with very small mixing angles to avoid thermalization will make it possible to explain the large-scale structure of the Universe and bring the contribution of sterile neutrinos to the dark matter of the Universe to the level of 27%. Sterile neutrinos are essentially right-handed neutrinos. The dynamic process of the dark matter generation, consisting of three right-handed neutrinos, is presented. Expansion of the Standard Model by introducing right-handed neutrinos seems possible. The scheme of masses and the scheme of mixing flavors are considered.