Black hole in an external magnetic field.
Abstract
The motion of and the scalar emission from particles which move in the proximity of a black hole are analyzed, assuming that the system is situated in an external asymptotically homogeneous constant magnetic field. The magnetic field is shown to generate a potential barrier which prevents the escape at infinity of charged and neutral particles in a plane orthogonal to the magnetic field. The barrier does not prevent the escape of zeromass particles for which the projection of the angular momentum on the field direction is zero. The existence of circular chargedparticle orbits that correspond to an almost 100percent mass defect is demonstrated, along with the existence of stable ultrarelativistic trajectories. The scalar emission from an ultrarelativistic particle moving along a stable orbit is shown to be gammasquare times that of a particle moving along an unstable ultrarelativistic geodesic trajectory in a Schwarzschild field, where gamma is the energy to mass ratio.
 Publication:

Zhurnal Eksperimentalnoi i Teoreticheskoi Fiziki
 Pub Date:
 March 1978
 Bibcode:
 1978ZhETF..74..801G
 Keywords:

 Black Holes (Astronomy);
 Gravitational Effects;
 Interstellar Magnetic Fields;
 Particle Motion;
 Charged Particles;
 Geodesic Lines;
 Neutral Particles;
 Orbital Mechanics;
 Particle Emission;
 Particle Mass;
 Particle Trajectories;
 Potential Fields;
 Relativistic Particles;
 Schwarzschild Metric;
 SpaceTime Functions;
 Universe;
 Astrophysics;
 Black Holes