Classification of Near-Horizon Geometries of Extremal Black Holes
Classification of Near-Horizon Geometries of Extremal Black Holes
Any spacetime containing a degenerate Killing horizon, such as an extremal black hole, possesses a well-defined notion of a near-horizon geometry. We review such near-horizon geometry solutions in a variety of dimensions and theories in a unified manner. We discuss various general results including horizon topology and near-horizon symmetry enhancement. …