Loop gravity string

@article{Freidel2017LoopGS,
  title={Loop gravity string},
  author={Laurent Freidel and Alejandro Perez and Daniele Pranzetti},
  journal={Physical Review D},
  year={2017},
  volume={95},
  pages={106002}
}
In this work we study canonical gravity in finite regions for which we introduce a generalisation of the Gibbons-Hawking boundary term including the Immirzi parameter. We study the canonical formulation on a spacelike hypersuface with a boundary sphere and show how the presence of this term leads to an unprecedented type of degrees of freedom coming from the restoration of the gauge and diffeomorphism symmetry at the boundary. In the presence of a loop quantum gravity state, these boundary… 

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