Spin networks for noncompact groups

  title={Spin networks for noncompact groups},
  author={Laurent Freidel and Etera R. Livine},
  journal={Journal of Mathematical Physics},
Spin networks are a natural generalization of Wilson loop functionals. They have been extensively studied in the case where the gauge group is compact and it has been shown that they naturally form a basis of gauge invariant observables. Physically the restriction to compact gauge groups is enough for the study of Yang–Mills theories, however it is well known that noncompact groups naturally arise as internal gauge groups for Lorentzian gravity models. In this context, a proper construction of… 
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