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The asymptotics of the SU(2) 15j symbol are obtained using coherent statesfor the boundary data. The geometry of all non-suppressed boundary data isgiven. For some boundary data, the resulting formula is interpreted in terms ofthe Regge action of the geometry of a 4-simplex in 4-dimensional Euclideanspace. This asymptotic formula can be used to derive and extend the asymptoticsof the spin foam amplitudes for quantum gravity models. The relation of theSU(2) Ooguri model to these quantum gravity models and their continuumLagrangians is discussed.

Quantum gravity asymptotics from the SU(2) 15j symbol