Generalized Spinfoams

Details Generalized Spinfoams Generalized Spinfoams

2010-11-09

arxiv.org/abs/1011.2149v2

Phys.Rev.D83:124020,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 pages, 3 figures

Scientific paper

10.1103/PhysRevD.83.124020

We reconsider the spinfoam dynamics that has been recently introduced, in the generalized Kaminski-Kisielowski-Lewandowski (KKL) version where the foam is not dual to a triangulation. We study the Euclidean as well as the Lorentzian case. We show that this theory can still be obtained as a constrained BF theory satisfying the simplicity constraint, now discretized on a general oriented 2-cell complex. This constraint implies that boundary states admit a (quantum) geometrical interpretation in terms of polyhedra, generalizing the tetrahedral geometry of the simplicial case. We also point out that the general solution to this constraint (imposed weakly) depends on a quantum number r_f in addition to those of loop quantum gravity. We compute the vertex amplitude and recover the KKL amplitude in the Euclidean theory when r_f=0. We comment on the eventual physical relevance of r_f, and the formal way to eliminate it.

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