Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ncimb..34..365t&link_type=abstract
Nuovo Cimento, Sezione B, vol. 34 B, Aug. 11, 1976, p. 365-379.
Astronomy and Astrophysics
Astrophysics
43
Black Holes (Astronomy), Equatorial Orbits, Gravitational Effects, Particle Motion, Particle Trajectories, Relativity, Astrophysics, Equations Of Motion, Vector Spaces
Scientific paper
The motion of spinning test particles in the gravitational field of a rotating black hole is analyzed in the pole-dipole approximation using the Papapetrou equations in the special case where the equations are exactly solvable and the particle trajectories obtained do not have parallel momentum and velocity. Attention is restricted to the equatorial plane of the Kerr metric, with the spin perpendicular to this plane. It is shown that the conserved quantities associated with the two Killing vectors give sufficient first integrals for a complete solution to be determined. The behavior of particle velocity in various orbits is examined, and the limits of validity of the pole-dipole approximation are evaluated. It is found that a black hole tends to repel particles with sufficiently high spin if the particle spin and black-hole rotation have the same sign. The problem of energy extraction from the innermost stable circular orbits is considered. The behavior of these orbits is shown to indicate that particles will be separated according to spin sign in the process of disk accretion in the equatorial plane and that the fraction of energy 'at infinity' that can be extracted from an accreting particle with spin opposite to the black-hole rotation may be as high as 100 per cent.
Calvani Massimo
de Felice Fernando
Tod K. P.
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