Causality and matter propagation in 3d spin foam quantum gravity

Details Causality and matter propagation in 3d spin foam quantum gravity Causality and matter propagation in 3d spin foam quantum gravity

2006-08-27

arxiv.org/abs/gr-qc/0608116v2

Phys.Rev.D74:104021,2006

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

v2: 26 pages, 2 figures, RevTeX, some typos and some formulae corrected with no relevant change for the results, one reference

Scientific paper

10.1103/PhysRevD.74.104021

In this paper we tackle the issue of causality in quantum gravity, in the context of 3d spin foam models. We identify the correct procedure for implementing the causality/orientation dependence restriction that reduces the path integral for BF theory to that of quantum gravity in first order form. We construct explicitly the resulting causal spin foam model. We then add matter degrees of freedom to it and construct a causal spin foam model for 3d quantum gravity coupled to matter fields. Finally, we show that the corresponding spin foam amplitudes admit a natural approximation as the Feynman amplitudes of a non-commutative quantum field theory, with the appropriate Feynman propagators weighting the lines of propagation, and that this effective field theory reduces to usual QFT in flat space in the no-gravity limit.

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