Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nmgm.meet.1291i&link_type=abstract
"THE NINTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and R
Physics
Scientific paper
A surface theoretic view of non-perturbative quantum gravity was studied some time ago based on 3 dimensional general relativity as a reformulation of the Ponzano-Regge model in Riemannian spacetime.1 Since 3 dimensional general relativity has no local degrees of freedom, the Ponzano-Regge model is known to be a topological field theory called lattice BF theory in 3 dimensions. On the other hand, the 4 dimensional generalization made by Ooguri is known as lattice BF theory in 4 dimensions, also a topological field theory.2 This Ooguri model similarly allows the surface theoretic view. However, since 4 dimensional general relativity contains local degrees of freedom, the Ooguri model is not a quantization of general relativity...
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