A Near Horizon Extreme Binary Black Hole Geometry*

A new solution of four-dimensional vacuum General Relativity is presented. It describes the near horizon region of the extreme (maximally spinning) binary black hole system with two identical extreme Kerr black holes held in equilibrium by a massless strut. Asymptotically, the geometry corresponds to the near horizon extreme Kerr black hole. This is the first example of a non-supersymmetric, near horizon extreme binary black hole geometry of two uncharged black holes. The black holes are co-rotating, and the solution is uniquely specified by the mass. The distance between the black holes is fixed, but there is a zero-distance limit where the objects collapse into one. The binary extreme system has finite entropy.