Phys. Rev. D 63, 041501(R) (2001) [5 pages]Spin foam model for Lorentzian general relativity
We present a spin foam formulation of Lorentzian quantum general relativity. The theory is based on a simple generalization of a Euclidean model defined in terms of a field theory over a group. Its vertex amplitude turns out to be the one recently introduced by Barrett and Crane. As in the case of its Euclidean relatives, the model fully implements the desired sum over 2-complexes which encodes the local degrees of freedom of the theory. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.63.041501
DOI:
10.1103/PhysRevD.63.041501
PACS:
04.60.-m
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