Escape of superheavy and highly energetic particles produced by particle collisions near maximally charged black holes

Understand

For particle collision near rapidly rotating Kerr black holes, the center-of-mass energy can be arbitrarily high if the angular momentum of either of the colliding particles is fine-tuned.

• Recently, it has been shown that particles which are produced by such a particle collision and escape to infinity cannot be very massive nor very energetic.
• For electrically charged black holes there is a similar phenomenon, where the center-of-mass energy for the collision of charged particles near the horizon can be arbitrarily high.
• One might expect that there would exist a similar bound on the energy and mass of particles that are produced by such a particle collision and escape to infinity.