Poynting Flux out of Rotating Black Hole and Accretion Flow through   Force-Free Magnetosphere
  The basic features of the Poynting flux from the horizon and the ergosphere of a black hole and from the accreting flow onto a black hole are discussed for the force-free magnetosphere. The accretion flow dominated by the Poynting flux is discussed and the possible Poynting flux from the equatorial plane inside the ergosphere is discussed. 
Hyun Kyu Lee