Comment on "Black Holes are Neither Particle Accelerators Nor Dark Matter Probes"

Abstract

The Banados-Silk-West effect consists in the possibility to get infinite energy in the centre of mass frame of two particles colliding near the black hole horizon. According to S. T. McWilliams, Phys. Rev. Lett. 110 (2013) 011102, the energy at infinity of the outcome vanishes because of infinite redshift when the point of collision approaches the horizon. I show that this is not so.

2 pages. Substantial revision

References in corpus (3)

• Collisional Penrose process near the horizon of extreme Kerr black holes
• Emergent Flux from Particle Collisions Near a Kerr Black Hole
• Black Holes are neither Particle Accelerators nor Dark Matter Probes

Cited by in corpus (10)

• High energy collision of two particles in wormhole spacetimes
• High Energy Collision of Particles in the Vicinity of Extremal Black Holes in Higher Dimensions: Banados-Silk-West Process as Linear Instability of Extremal Black Holes
• Unbound geodesics from the ergosphere and potential observability of debris from ultrahigh energy particle collisions
• Enhanced Line Signals from Annihilating Kaluza-Klein Dark Matter
• Banados-Silk-West effect with nongeodesic particles: Nonextremal horizons
• Acceleration of particles by acceleration horizons
• Rotation as an origin of high energy particle collisions
• Neutral particle collisions near Gibbons-Maeda-Garfinkle-Horowitz-Strominger black holes after shadow observations
• High energy collision of particles in the magnetic field far from black holes
• BSW process of the slowly evaporating charged black hole