Marios Christodoulou, Miklos Långvik, Aldo Riello, Christian Röken, Carlo Rovelli
We suggest that large radiative corrections appearing in the spinfoam framework might be tied to the implicit sum over orientations. Specifically, we show that in a suitably simplified context the characteristic "spike" divergence of the Ponzano-Regge model disappears when restricting the theory to just one of the two orientations appearing in the asymptotic limit of the vertex amplitude.
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http://arxiv.org/abs/1207.5156
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