Speaker
Description
We study theoretically the propagation of cosmic neutrinos in an interstellar magnetic field, which is known to have both constant and stochastic components. The neutrino interaction with a magnetic field is assumed to be due to a non-zero neutrino magnetic moment. For taking into account the effect of magnetic field fluctuations, the formalism of the Lindblad equation is employed that describes the density matrix evolution of a dissipative system. An analytical solution of the Lindblad equation is obtained for the Dirac and Majorana neutrinos. It takes into account the effects of decoherence and relaxation on the propagation of cosmic neutrinos. On the basis of the obtained solution, we carry out and present numerical calculations for the flavor, spin, and spin-flavor oscillations of ultrahigh-energy neutrinos in an interstellar magnetic field. The roles of the deterministic and stochastic neutrino magnetic moment interactions are outlined.
