Rotating black holes in a Randall-Sundrum brane with a cosmological
  constant
  In this work we have constructed axially symmetric vacuum solutions of the
gravitational field equations in a Randall-Sundrum brane. A non-null effective
cosmological constant is considered, and asymptotically de Sitter and anti-de
Sitter spacetimes are obtained. The solutions describe rotating black holes in
a four-dimensional brane. Optical features of the solutions are treated,
emphasizing the rotation of the polarization vector along null congruences.
