… suggested that the Penrose process could serve as an energy mechanism for jets. In this
paper we derive strict limits on the energies which can be achieved by the Penrose process. It …

… process: absorption of negative energy and negative angular momentum. We also show …
for the Penrose process to occur is for the Noether current (the conserved energymomentum …

… It is well known that the Penrose process (PP) is a way for extracting energy from a black
hole (BH). An analytical and partially numerical study of the PP is presented for a particular case…

… energies E cm in their centre-of-mass frame. There are indications that the Killing energy of
… black-hole horizon (the so-called super-Penrose process). They include the participation of a …

… the Penrose process, concentrating attention to the extreme regime of the magnetic Penrose
process … The energy loss determined by the GZK-cutoff puts strong limits on the distance of …

… For a particle falling in from rest at infinity (\(E/m=1\)) and breaking into two equal-mass
particles with mass \(m'\) in the ergosphere, we see that the lower energy limit can be negative …

… is the efficiency of original Penrose process leading to Equations (5) and (6). In the
absence of magnetic field, MPP turns to original Penrose process giving its lower limit with the …

… The Penrose process (hereafter PP) means that a parent … energy whereas particle 2 returns
to infinity with an energy bigger … In general scenario we take the limit P0 → 0. This means that …

… the collisional Penrose process may power gamma rays and ultrahigh-energy cosmic rays.
… holes spinning at the Thorne limit a ∼ 0.998 [18] we still find efficiencies as large as η ∼ 10 …

… II, we prepare for the analysis of the collisional Penrose process, reviewing geodesic …
III A, we investigate the upper limits of the energy of the escaping particle and of the energy…