… of negative energy states relative to infinity. This is the key property that drives Penrose
process of energy extraction from a rotating black hole. Following the original idea of Penrose, let …

… is analogous to that in the mechanical Penrose process: absorption of negative energy
and … for the Penrose process to occur is for the Noether current (the conserved energymomentum …

… One difference between our solutions and the usual Penrose process is that we consider
nongeodesic trajectories, while the usual Penrose process describes geodesics. External …

… The energy extraction of the collisional Penrose process has been investigated in recent …
the energy extraction of spinning massive particles is calculated via the super Penrose process. …

… have also indicated that the energy gain by the Penrose process will not be great. … insofar
as most of the possible astrophysical applications of the Penrose process are concerned. If E’/M…

… energy extraction. We present an analytic formulation to investigate the collisional Penrose
process … as the colliding particles, the energy-extraction efficiency is bounded by 2.19 approx…

… connection with the Penrose-type energy extractionprocesses. … viability ofthe Penrose-type
energy extractionprocesses can be … aspects of the Penrose-type energy extraction from black …

… process of extraction of rotational energy of black holes by Penrose is a special case of the
energy … flow of energy-at-infinity in the Penrose process is inseparable from the negative…

… with negative energy inside the generalized ergosphere. We investigate the question about
the efficiency of the Penrose process and show that one cannot extract large energies from a …

… processes of this kind. But if the efficiency of the process is to be gauged by the ratio of energy
… after all, it is the rotationał energy of the hole that we are proposing to extract), then we are …