ИСТИНА

It is well-known that dense matter can strongly affect the neutrino moving through it. It has been recently realized that transversal matter motion can substantially change neutrino dynamics in some astrophysical settings and, in particular, leads to the appearance of spin oscillations (see [1] and references therein). In this work we investigate neutrino quantum sates in transversally moving matter with respect to the conserved spin observable (operator) introduced earlier [2]. As it was shown by us in [3] the relevant spin quantum numbers can change due to electromagnetic interaction mediated by neutrino magnetic moment leading to the effect of neutrino spin light. In the present paper we also continue our studies and discuss this possibility in some detail with focus on neutrino motion in transversal matter currents. [1] P.Pustoshny, A.Studenikin, Neutrino spin and spin-flavour oscillations in transversal matter currents with standard and non-standard interactions. Phys. Rev. D 98 (2018) 113009 (14 p.). [2] A. Grigoriev, A. Studenikin, A. Ternov, Neutrino spin operator and dispersion in moving matter, Eur.Phys.J.C 82 (2022) 287. [3] A. Grigoriev, A. Lokhov, A. Studenikin, A. Ternov, Spin light of neutrino in astrophysical environments, J. Cosmol. Astropart. Phys. (2017) 068P_0517 (23 p.).