Barrett-Crane spin foam model from generalized BF-type action for gravity

Abstract

We study a generalized action for gravity as a constrained BF theory, and its relationship with the Plebanski action. We analyse the discretization of the constraints and the spin foam quantization of the theory, showing that it leads naturally to the Barrett-Crane spin foam model for quantum gravity. Our analysis holds true in both the Euclidean and Lorentzian formulation.

15 pages, revtex; a sign corrected (area spectrum); some of these results were presented in a preliminary form in gr-qc/0103081; v2: improved presentation of the results, some changes in the text; to appear in Phys. Rev. D

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