The asymmetry of the angular dependence of neutrino emission from rotating black holes is calculated. A low-frequency analytic approximation demonstrates the preferential emission of neutrinos (antineutrinos) antiparallel (parallel) to the direction of the black hole's angular momentum vector. Numerical calculations are performed to reveal the detailed nature of the neutrino emission on polar angle, neutrino energy, and black-hole angular momentum and mass.
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Leahy et al. (1979) studied this question.
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