Gravitational scattering of spinning neutrinos by a rotating black hole with a slim magnetized accretion disk

Abstract

We study neutrinos gravitationally scattered off a rotating supermassive black hole which is surrounded by a thin accretion disk with a realistic magnetic field. Neutrinos are supposed to be Dirac particles having a nonzero magnetic moment. Neutrinos move along arbitrary trajectories, with the incoming flux being parallel to the equatorial plane. We exactly account for the influence of both gravity and the magnetic field on the neutrino motion and its spin evolution. The general statement that the helicity of an ultrarelativistic neutrino is constant in the particle scattering in an arbitrary gravitational field is proven within the quasiclassical approach. We find the measurable fluxes of outgoing neutrinos taking into account the neutrino spin precession in the external field in curved spacetime. These fluxes turn out to be significantly suppressed for some parameters of the system. Finally, we discuss the possibility to observe the predicted phenomena for core-collapsing supernova neutrinos in our Galaxy.

16 pages in LaTeX2e, 11 eps figures; paper is significantly extended, Fig. 3 is added, new appendix is included; version to be published in Classical and Quantum Gravity

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Cited by in corpus (6)

• Scattering of neutrinos by a rotating black hole accounting for the electroweak interaction with an accretion disk
• Neutrino spin oscillations in a magnetized Polish doughnut
• Spin oscillations in neutrino gravitational scattering
• Neutrino spin oscillations near a black hole
• Spin oscillations of neutrinos scattered by the supermassive black hole in the galactic center
• Spin and flavor oscillations of neutrinos in gravitational fields