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math-ph2008★ 19 cited
The Ponzano-Regge asymptotic of the 6j symbol: an elementary proof
Razvan Gurau
In this paper we give a direct proof of the Ponzano-Regge asymptotic formula for the Wigner 6j symbol starting from Racah's single sum formula. Our method treats halfinteger and in…
math-ph2007★ 50 cited
Non-Commutative Complete Mellin Representation for Feynman Amplitudes
R. Gurau, A. P. C. Malbouisson, V. Rivasseau +1
We extend the complete Mellin (CM) representation of Feynman amplitudes to the non-commutative quantum field theories. This representation is a versatile tool. It provides a quick…