High energy head-on particle collisions near event horizons: classifcation of scenarios

Abstract

We consider head-on collisions of two particles near the event horizon. Particle 1 is outgoing, particle 2 is ingoing. We elucidate, in which case the energy $E_{c.m.}$ in the center of mass frame can grow unbounded. If the proper time between the horizon and an arbitrary point outside it for particle 1 is finite, we deal with a white hole. If it is infinite, we deal with a black hole. Particles can be either free or experience the action of a finite force. Our results are complementary to those for the standard BSW effect when particles move in the same direction. The results rely on classification of particles developed in our previous work H.V. Ovcharenko, O.B. Zaslavskii, Phys. Rev. D 108, 064029 (2023).

16 pages, substantial revision

References in corpus (5)

• Revised upper limit to energy extraction from a Kerr black hole
• Are black holes totally black?
• Banados-Silk-West effect with nongeodesic particles: Nonextremal horizons
• Bañados-Silk-West effect with finite forces near different types of horizons: general classification of scenarios
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Cited by in corpus (2)

• Penrose and super-Penrose energy extraction from a Reissner-Nordström black hole spacetime with a cosmological constant through the BSW mechanism: Full story
• Dynamics of redshift/blueshift during free fall under the Schwarzschild horizon