Neutrino spin oscillations in external fields in curved spacetime
arXiv:1902.11285 · doi:10.1103/PhysRevD.99.116021
Abstract
We study spin oscillations of massive Dirac neutrinos in background matter, electromagnetic and gravitational fields. First, using the Dirac equation for a neutrino interacting with the external fields in curved spacetime, we rederive the quasiclassical equation for the neutrino spin evolution, which was proposed previously basing on principles of the general covariance. Then, we apply this result for the description of neutrino spin oscillations in nonmoving and unpolarized matter under the influence of a constant transverse magnetic field and a gravitational wave. We derive the effective Schrödinger equation for neutrino oscillations in these external fields and solve it numerically. Choosing realistic parameters of external fields, we show that the parametric resonance can take place in spin oscillations of low energy neutrinos. Some astrophysical applications are briefly discussed.
arXiv comment11 pages in Revtex, 4 pdf figures; paper is significantly revised; figures are replotted; the discussion on spin evolution in curved spacetime is extended; Sec. III, where astrophysical applications are considered, is significantly revised; version to be published in Phys.Rev.D
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