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Spacetime states and covariant quantum theory
Michael Reisenberger, Carlo Rovelli
In it's usual presentation, classical mechanics appears to give time a very special role. But it is well known that mechanics can be formulated so as to treat the time variable on…
GPS observables in general relativity
Carlo Rovelli
I present a complete set of gauge invariant observables, in the context of general relativity coupled with a minimal amount of realistic matter (four particles). These observables…
GR16: Quantum General Relativity
Carlo Rovelli
This is the report of the "Quantum General Relativity" session, at the 16th International Conference on General Relativity & Gravitation, held on July 15th to 21st 2001, in Durban,…
Partial observables
Carlo Rovelli
We discuss the distinction between the notion of partial observable and the notion of complete observable. Mixing up the two is frequently a source of confusion. The distinction be…
Observables in quantum gravity
Alejandro Perez, Carlo Rovelli
We study a family of physical observable quantities in quantum gravity. We denote them W functions, or n-net functions. They represent transition amplitudes between quantum states…