Neutrino spin oscillations in a magnetized Polish doughnut

Abstract

We study the gravitational scattering of ultrarelativistic neutrinos off a rotating supermassive black hole (BH) surrounded by a thick magnetized accretion disk. Neutrinos interact electroweakly with background matter and with the magnetic field in the disk since neutrinos are supposed to possess nonzero magnetic moments. The interaction with external fields results in neutrino spin oscillations. We find that the toroidal magnetic field, inherent in the magnetized Polish doughnut, does not cause a significant spin-flip for any reasonable strengths of the toroidal component. The reduction of the observed neutrino flux, owing to neutrino spin oscillations, is predicted. A poloidal component of the magnetic field gives the main contribution to the modification of the observed flux. The neutrino interaction with matter, rotating with relativistic velocities, also changes the flux of neutrinos. We briefly discuss the idea of the neutrino tomography of magnetic field distributions in accretion disks near BHs.

18 pages in JCAP LaTeX style, 15 eps figures; text is revised slightly, several new references are added, version published in JCAP

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Cited by in corpus (4)

• 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