Journal of Experimental and Theoretical PhysicsJournal of Experimental and Theoretical Physics0044-45103034-641XRussian Academy of Science10.31857/S0044451023120088Improved Cosmological Bounds for Mixing Scenarios of Three Sterile Neutrino GenerationsУлучшенные космологические ограничения для сценариев смешивания трех поколений стерильных нейтриноDubininM. N.ДубининМ. Н. dubinin_m_n_noemail@ras.ruKazarkinD. M.КазаркинД. М. kazarkin_d_m_noemail@ras.ruМосковский государственный университет им. М. В. ЛомоносоваFaculty of Physics, Moscow State UniversityМосковский государственный университет имени М. В. ЛомоносоваFaculty of Physics, Moscow State University011220231646942954

The gauge SU(2)L × U(1) model with the extension of the lepton sector by three right-handed Majorana sterile neutrinos is considered. The complete mass matrix of 6 × 6 active and sterile neutrinos is diagonalized. The cosmological bounds following from the lifetime of sterile neutrinos and the fraction of energy carried by sterile neutrino dark matter are obtained. The deviations from the “fine-tuned” mixing scenario sensitive to the mass of the lightest standard (active) neutrino are considered, and the regions of the model parameter space corresponding to these deviations are distinguished.

Рассматривается калибровочная SU (2)L × U (1) модель с расширением лептонного сектора тремя правыми майорановскими стерильными нейтрино. Проведена диагонализация полной массовой матрицы 6 × 6 активных и стерильных нейтрино. Получены космологические ограничения, вытекающие из времени жизни стерильных нейтрино и доли энергии, переносимой стерильной нейтринной темной материей. Рассмотрены отклонения от сценария «тонкой настройки» смешивания, чувствительного к массе наиболее легкого стандартного (активного) нейтрино и выделены соответствующие этим отклонениям области пространства параметров модели.

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