Higher dimensional non-Kerr black hole and energy extraction
  We investigate the properties of the horizons and ergosphere in a rotating
higher dimensional (HD) deformed Kerr-like black hole. We also explicitly bring
out the effect of deformation parameter $\epsilon$ and the extra dimension on
the efficiency of the Penrose process of energy extraction from a black hole.
It is interesting to see that the ergosphere size is sensitive to the
deformation parameter $\epsilon$ as well as spacetime dimensions $D$. This
gives rise to a much richer structure of the ergosphere in a HD non-Kerr black
hole, thereby making the Penrose process more efficient compared with that of
the four-dimensional Kerr black hole.
