New effect in neutrino spin oscillations in transversal matter currents with nonstandard interactions

We perform a systematic study of a new phenomenon of neutrino spin and spin-flavor oscillations induced by transverse matter currents, based on the developed quantum treatment of the phenomenon. Both standard and nonstandard interactions of neutrinos with the external medium are taken into account. As an example, the oscillations in question are considered under the conditions of a binary neutron star merger model.