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gr-qc2000
Notes for a brief history of quantum gravity
Carlo Rovelli
I sketch the main lines of development of the research in quantum gravity, from the first explorations in the early thirties to nowadays.
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…