13,832 research outputs found
Black holes and particles with zero or negative energy
We study properties of particles with zero or negative energy and a nonzero
orbital angular momentum in the ergosphere of a rotating black hole. We show
that the sign of the particle energy is uniquely determined by the angular
velocity of its rotation in the ergosphere. We give a simple proof of the fact
that extreme black holes cannot exist. We investigate the question of the
possibility of an unlimited energy increase in the center-of-mass system of two
colliding particles, one or both of which have negative or zero energy.Comment: 13 pages, 7 figure
High energy particles with negative and positive energies in the vicinity of black holes
It is shown that the energy in the centre of mass frame of two colliding
particles in free fall at any point of the ergosphere of the rotating black
hole can grow without limit for fixed energy values of particles on infinity.
The effect takes place for large negative values of the angular momentum of one
of the particles. It occurs that the geodesics with negative energy in
equatorial plane of rotating black holes cannot originate or terminate inside
the ergosphere. Their length is always finite and this leads to conclusion that
they must originate and terminate inside the gravitational radius of the
ergosphere. The energy in the centre of mass frame of one particle falling into
the gravitational radius and the other arriving from the area inside it is
growing without limit on the horizon.Comment: 12 pages, no figures. arXiv admin note: substantial text overlap with
arXiv:1301.0698, arXiv:1304.736
On the energy of particle collisions in the ergosphere of the rotating black holes
It is shown that the energy in the centre of mass frame of colliding
particles in free fall at any point of the ergosphere of the rotating black
hole can grow without limit for fixed energy values on infinity. The effect
takes place for large negative values of the angular momentum of one of the
particles.Comment: 4 pages, 1 figur
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