Spin foam quantization and anomalies

@article{Bojowald2003SpinFQ,
  title={Spin foam quantization and anomalies},
  author={Martin Bojowald and Alejandro Perez},
  journal={General Relativity and Gravitation},
  year={2003},
  volume={42},
  pages={877-907}
}
The most common spin foam models of gravity are widely believed to be discrete path integral quantizations of the Plebanski action. However, their derivation in present formulations is incomplete and lower dimensional simplex amplitudes are left open to choice. Since their large-spin behavior determines the convergence properties of the state-sum, this gap has to be closed before any reliable conclusion about finiteness can be reached. It is shown that these amplitudes are directly related to… 
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