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The process of particle collision in the vicinity of black holes is known togenerate unbounded energies in the center-of-mass frame (the Banados-Silk-West(BSW) effect) under specific conditions. We consider this process in thecharged black hole metrics, namely, the Reissner-Nordstrom (RN) andMajumdar-Papapetrou (MP) metrics. We consider the energy extraction fromBardeen regular black hole due to BSW effect. Like in RN case, we show thatthere is no restriction on energy extraction, but for real charged particlesthis effect is negligible. We derive necessary and sufficient conditions forthis process. The conditions for the BSW effect in RN and MP metrics are shownto be identical, which is explained by the asymptotic equivalence of the twometrics near the horizons. Energy extraction in the RN metric is discussed. Itis shown that if two real particles collide while falling onto a black hole,they are extremely unlikely to generate an ultra-massive particle. For the caseof head-on collisions, we derive an upper bound on extracted mass, whichdepends on the lapse function of the metric at the point of collision.

On particle collisions in the vicinity of the charged black holes