Spin foam models as energetic causal sets

@article{Corts2014SpinFM,
  title={Spin foam models as energetic causal sets},
  author={Marina Cort{\^e}s and Lee Smolin},
  journal={Physical Review D},
  year={2014},
  volume={93},
  pages={084039}
}
Energetic causal sets are causal sets endowed by a flow of energy-momentum between causally related events. These incorporate a novel mechanism for the emergence of space-time from causal relations. Here we construct a spin foam model which is also an energetic causal set model. This model is closely related to the model introduced in parallel by Wolfgang Wieland in arXiv:1407.0025, and this construction makes use of results used there. What makes a spin foam model also an energetic causal set… 
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