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A definition of the Ponzano–Regge quantum gravity model in terms of surfacesa)
Junichi Iwasaki
Source abstract
We show that the partition function of the Ponzano–Regge quantum gravity model can be written as a sum over surfaces in a (2+1)-dimensional space–time. We suggest a geometrical meaning, in terms of surfaces, for the (regulated) divergences that appear in the partition function.
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