scholarly journals HIGH ENERGY PARTICLE COLLISIONS NEAR THE BIFURCATION SURFACE

2013 ◽  
Vol 22 (08) ◽  
pp. 1350044 ◽  
Author(s):  
OLEG B. ZASLAVSKII
Keyword(s):  
Center Of Mass ◽  
High Energy ◽  
Generic Property ◽  
High Energy Particle ◽  
De Sitter ◽  
Particle Collisions ◽  
Energy Particle ◽  
Mass Frame ◽  
Bifurcation Surface ◽  
De Sitter Metric

We consider generic nonextremal stationary dirty black holes. It is shown that in the vicinity of any bifurcation surface the energy of collision of two particles in the center of mass frame can grow unbound. This is a generic property that, in particular, includes collisions near the inner black hole horizon analyzed earlier by different methods. The similar results are also valid for cosmological horizons. The case of the de Sitter metric is discussed.

scholarly journals Rotation as an origin of high energy particle collisions

2016 ◽  
Vol 31 (04) ◽  
pp. 1650029 ◽  
Author(s):  
O. B. Zaslavskii
Keyword(s):  
Center Of Mass ◽  
High Energy ◽  
High Energy Particle ◽  
Particle Collisions ◽  
Energy Particle ◽  
Relativistic Stars ◽  
Mass Frame ◽  
Model Independent

We consider collision of two particles in rotating spacetimes without horizons. If the metric coefficient responsible for rotation of spacetime is big enough, the energy of collisions in the center of mass frame can be as large as one likes. This can happen in the ergoregion only. The results are model-independent and apply both to relativistic stars and wormholes.

scholarly journals New Scenarios of High-Energy Particle Collisions Near Wormholes

Universe ◽  
2020 ◽  
Vol 6 (12) ◽  
pp. 227
Author(s):  
Oleg B. Zaslavskii
Keyword(s):  
Center Of Mass ◽  
High Energy ◽  
Large Energy ◽  
High Energy Particle ◽  
Particle Collisions ◽  
Energy Particle ◽  
Wormhole Throat ◽  
Penrose Process ◽  
High Energy Collisions

We suggest two new scenarios of high-energy particle collisions in the background of a wormhole. In scenario 1, the novelty consists of the fact that the effect does not require two particles coming from different mouths. Instead, all such scenarios of high energy collisions develop, when an experimenter sends particles towards a wormhole from the same side of the throat. For static wormholes, this approach leads to indefinitely large energy in the center of mass. For rotating wormholes, it makes possible the super-Penrose process (unbounded energies measured at infinity). In scenario 2, one of colliding particles oscillates near the wormhole throat from the very beginning. In this sense, scenario 2 is intermediate between the standard one and scenario 1 since the particle under discussion does not come from infinity at all.

scholarly journals Kinematics of ultra-high energy particle collisions near black holes in the magnetic field

2015 ◽  
Vol 30 (06) ◽  
pp. 1550027 ◽  
Author(s):  
O. B. Zaslavskii
Keyword(s):  
Magnetic Field ◽  
Black Holes ◽  
Center Of Mass ◽  
High Energy ◽  
High Energy Particle ◽  
Ultra High Energy ◽  
Particle Collisions ◽  
Mass Frame ◽  
Bsw Effect ◽  
The Magnetic Field

There are different versions of collisions of two particles near black holes with unbound energy E cm in the center of mass frame. The so-called BSW effect arises when a slow fine-tuned "critical" particle hits a rapid "usual" one. We discuss a scenario of collision in the strong magnetic field for which explanation turns out to be different. Both particles are rapid but the nonzero angle between their velocities (which are both close to c, the speed of light) results in a relative velocity close to c and, hence, big E cm .

scholarly journals High energy particle collisions and geometry of horizon

2016 ◽  
Vol 25 (10) ◽  
pp. 1650095 ◽  
Author(s):  
O. B. Zaslavskii
Keyword(s):  
Black Hole ◽  
Center Of Mass ◽  
Naked Singularity ◽  
High Energy ◽  
Fine Tuning ◽  
High Energy Particle ◽  
Axially Symmetric ◽  
Particle Collisions ◽  
Material Source ◽  
Mass Frame

We consider collision of two geodesic particles near the lightlike surface (black hole horizon or naked singularity) of such an axially symmetric rotating or static metric that the coefficient [Formula: see text] on this surface. It is shown that the energy in the center of mass frame [Formula: see text] is indefinitely large even without fine-tuning of particles’ parameters. Kinematically, this is the collision between two rapid particles that approach the horizon almost with the speed of light but at different angles (or they align along the normal to the horizon too slowly). The latter is the reason why the relative velocity tends to that of light, hence to high [Formula: see text]. Our approach is model-independent. It relies on general properties of geometry and is insensitive to the details of material source that supports the geometries of the type under consideration. For several particular models (the stringy black hole, the Brans–Dicke analogue of the Schwarzschild metric and the Janis–Newman–Winicour one) we recover the results found in literature previously.

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