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

Understand

The asymptotics of the SU(2) 15j symbol are obtained using coherent states for the boundary data.

• The geometry of all non-suppressed boundary data is given.
• For some boundary data, the resulting formula is interpreted in terms of the Regge action of the geometry of a 4-simplex in 4-dimensional Euclidean space.
• This asymptotic formula can be used to derive and extend the asymptotics of the spin foam amplitudes for quantum gravity models.