title: Four-Dimensional Entropy from Three-Dimensional Gravity.
abstract: At the horizon of a black hole, the action of (3+1)-dimensional loop quantum gravity acquires a boundary term that is formally identical to an action for three-dimensional gravity. I show how to use this correspondence to obtain the entropy of the (3+1)-dimensional black hole from well-understood conformal field theory computations of the entropy in (2+1)-dimensional de Sitter space.
authors: Department of Physics, University of California, Davis, California 95616, USA.
authors: S
authors: S
authors: Carlip