SO0(1, d+1) Racah coefficients:: Type I representations

We use AdS/CFT inspired methods to study the Racah coefficients for type I representations of the Lorentz group SO0(1,d+1) with d > 1. For such representations (a multiple of) the Racah coefficient can be represented as an integral of a product of six bulk-to-bulk propagators over four copies of the hyperbolic space Hd+1. To compute the integrals we represent the bulk-to-bulk propagators in terms of bulk-to-boundary ones. The bulk integrals can be computed explicitly, and the boundary integrations are carried out by introducing Feynman parameters. The final result is an integral representation of the Racah coefficient given by four Barnes-Mellin type integrals. (c) 2006 American Institute of Physics.