ИСТИНА

It is believed that the running (for instance, COHERENT) and forthcoming terrestrial neutrino experiments will be sensitive to the neutrino charge radius [1] that is one of the neutrino fundamental electromagnetic characteristics [2] predicted [3] to be non-zero even in the Standard Model. In this work we continue our studies [4] on neutrino oscillations accounting for diagonal and non-diagonal neutrino charge radii. We consider spin and spin-flavor neutrino oscillations in an extreme astrophysical environment and on the basis of exact expressions for the corresponding neutrino oscillation probabilities we study conditions for possible neutrino resonances engendered by the neutrino charge radii. We apply the obtained results to an extreme astrophysical environment. This research has been supported by the Interdisciplinary Scientific and Educational School of Moscow University “Fundamental and Applied Space Research” and also by the Russian Foundation for Basic Research under Grant No. 20-52-53022-GFEN-a. The work of KS is also supported by the RFBR under grant No. 20-32-90107 and by the “BASIS” Foundation No. 20-2-2-3-1. [1] M.Cadeddu, F.Dordei, C.Giunti, K.Kouzakov, E.Picciau, A.Studenikin, Phys.Rev.D 100 (2019) 073014. [2] C.Giunti, A.Studenikin, Rev.Mod.Phys. 87 (2015) 531. [3] J.Bernabeu, L.G.Cabral-Rosetti, J.Papavassiliou, J.Vidal, Phys.Rev.D 62 (2000) 113012. [4] K.Kouzakov, F.Lazarev, V.Shakhov, K.Stankevich, A.Studenikin, PoS ICHEP2020 (2021) 217.