Group Integral Techniques for the Spinfoam Graviton Propagator

Details Group Integral Techniques for the Spinfoam Graviton Propagator Group Integral Techniques for the Spinfoam Graviton Propagator

2006-08-30

arxiv.org/abs/gr-qc/0608131v2

JHEP0611:092,2006

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 pages

Scientific paper

10.1088/1126-6708/2006/11/092

We consider the proposal of gr-qc/0508124 for the extraction of the graviton propagator from the spinfoam formalism. We propose a new ansatz for the boundary state, using which we can write the propagator as an integral over SU(2). The perturbative expansion in the Planck length can be recast into the saddle point expansion of this integral. We compute the leading order and recover the behavior expected from low-energy physics. In particular, we prove that the degenerate spinfoam configurations are suppressed.

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