The classical evaluation of relativistic spin networks
Barrett, John W. (1998) The classical evaluation of relativistic spin networks. Adv.Theor.Math.Phys., 2 . pp. 593-600.
The evaluation of a relativistic spin network for the classical case of the Lie group SU(2) is given by an integral formula over copies of SU(2). For the graph determined by a 4-simplex this gives the evaluation as an integral over a space of geometries for a 4-simplex.
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