http://arxiv.org/abs/hep-th/0611042(adsbygoogle = window.adsbygoogle || []).push({});

Hidden Quantum Gravity in 4d Feynman diagrams: Emergence of spin foams

Aristide Baratin, Laurent Freidel

28 pages, 7 figures

"We show how Feynman amplitudes of standard QFT on flat and homogeneous space can naturally be recast as the evaluation of observables for a specific spin foam model, which provides dynamics for the background geometry. We identify the symmetries of this Feynman graph spin foam model and give the gauge-fixing prescriptions. We also show that the gauge-fixed partition function is invariant under Pachner moves of the triangulation, and thus defines an invariant of four-dimensional manifolds. Finally, we investigate the algebraic structure of the model, and discuss its relation with a quantization of 4d gravity in the limit where the Newton constant goes to zero."

this is the one that John Baez started a thread about earlier this year, for us to discuss and get the basic concepts in hand before the paper appeared

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# Baratin-Freidel: Hidden Quantum Gravity in 4d Feynman diagrams

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