Neutrino spin oscillations in gravitational fields
S.A. Alavi1, S.F. Hosseini2
(1) Department of Physics, Hakim Sabzevari University, P. O. Box 397, Sabzevar, Iran
(2) Education management organization, Quds city, P. O. Box 1187613911, Tehran, Iran
We study neutrino spin oscillations in black hole backgrounds. In the case of a charged black hole, the maximum frequency of oscillations is a monotonically increasing function of the charge. For a rotating black hole, the maximum frequency decreases with increasing angular momentum. In both cases, the frequency of spin oscillations decreases as the distance from the black hole grows. As a phenomenological application of our results, we study a simple bipolar neutrino system which is an interesting example of collective neutrino oscillations. We show that the precession frequency of the flavor pendulum as a function of the neutrino number density will be higher for a charged non-rotating black hole as compared with a neutral rotating one.
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