Penrose process

The Penrose process, which was theorized by Roger Penrose in 1969, states that it is possible for a rotating black hole to extract energy. This is possible because the rotational energy of a rotating black hole is outside the event horizon, in the region of the ergosphere. The Penrose process you can be illustrated by a simple example: a particle with four-momentum is thrown in the direction of the rotating black hole. Is the energy of this particle. The energy of the particle remains constant during the fall into the black hole. On entry into the sphere of the particles disintegrates in Ergo, a particle having a positive angular momentum and energy in a particle with a negative angular momentum and energy. The angular momentum and conservation of energy states that

Contracted with this equation, so also applies

The particles with positive angular momentum and energy escapes from the ergosphere, whereas the particle falls into the black hole with negative angular momentum and energy. For an outside observer, this appears when you extract energy from the black hole, there. The mass of the black hole reduces to itself, which means that it has an energy extracted from the black hole.