12j-symbols and four-dimensional quantum gravity


We propose a model which represents a four-dimensional version of Ponzano and Regge’s three-dimensional euclidean quantum gravity. In particular we show that the exponential of the euclidean Einstein-Regge action for a 4d-discretized block is given, in the semiclassical limit, by a gaussian integral of a suitable 12j-symbol. Possible developments of this… (More)


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