Collimated Escaping Vortical Polar e-e+ Jets Intrinsically Produced by   Rotating Black Holes and Penrose Processes
  In this paper, I present results from theoretical and numerical (Monte Carlo) N-particle fully relativistic 4-D analysis of Penrose scattering processes (Compton and gamma-gamma-->e-e+) in the ergosphere of a supermassive or stellar mass Kerr (rotating) black hole. Specifically, the escape conditions and the escaping orbits of the Penrose pair production (gamma-gamma-->e-e+) electrons are analyzed, revealing that these particles escape along collimated, jet geodesic trajectories encircling the polar axis. Such collimated vortical tightly wound coil-like trajectories of relativistic particles are inherent properties of rotating black holes. The helical polar angles of escape for these e-e+ pairs range from 40 degrees to 0.5 degree (for the highest energy particles). These jet distributions appear to be consistent with the astrophysical jets of active galactic nuclei (AGNs) and galactic black holes and suggest a mechanism for precollimation within the inner radius of the dynamically stable accretion disk. 
Reva Kay Williams (University of Florida)