Ergosphere

A rotating black hole (Kerr black hole or Kerr-Newman black hole) is a black hole that possesses angular momentum. It is one of four possible types of black holes that could exist in the theory of gravitation called General Relativity. Black holes can be characterized by three (and only three) quantities M, J and Q, namely:mass M, (Schwarzschild black hole if J=0 and Q=0)angular momentum J (Kerr black hole if J not zero and Q=0) electric charge Q (charged black hole or Reissner-Nordström black hole if Q not zero and J=0; or a Kerr-Newman black hole if both J and Q not zero).
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The region around a black hole in which the spacetime continuum is actually dragged around by the rotation of the black hole. It this region not even