Energy extraction from extremal charged black holes due to the BSW effect

Understand

Two particles can collide in the vicinity of a rotating black hole producing the divergent energy in the centre of mass frame (the BSW effect).

• However, it was shown recently that an observer at infinity can register quite modest energies E and masses m which obey some upper bounds.
• In the present work the counterpart of the original BSW effect is considered that may occur even for radial motion of colliding particles near charged static black holes.
• It is shown that in some scenarios there are no upper bound on E and m .