3 papers
gr-qc2000
Spin foams as Feynman diagrams
Michael Reisenberger, Carlo Rovelli
It has been recently shown that a certain non-topological spin foam model can be obtained from the Feynman expansion of a field theory over a group. The field theory defines a natu…
gr-qc1997
A lattice worldsheet sum for 4-d Euclidean general relativity
Michael P. Reisenberger
A lattice model for four dimensional Euclidean quantum general relativity is proposed for a simplicial spacetime. It is shown how this model can be expressed in terms of a sum over…
gr-qc1994
Worldsheet formulations of gauge theories and gravity
Michael Reisenberger
The evolution operator for states of gauge theories in the graph representation (closely related to the loop representation of Gambini and Trias, and Rovelli and Smolin) is formula…