Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2008-02-08
Int.J.Mod.Phys.A23:1209-1213,2008
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
4 pages,; to appear in the proceedings of the II Stueckelberg Workshop, Int.J.Mod.Phys.A
Scientific paper
10.1142/S0217751X0804007X
We review the construction of the tensorial structure of the graviton propagator in the context of loop quantum gravity and spinfoam formalism. The main result of this analysis is that applying the same strategy used to compute the diagonal terms, the Barrett-Crane vertex is unable to yield the correct propagator in the long distance limit. The problem is in the intertwiner-independence of the Barrett-Crane vertex. We also review the asymptotic behavior of an alternative vertex that is able to give the correct propagator.
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