Abstract
We construct the operator that projects on the physical states in loop quantum gravity. To this aim, we consider a diffeomorphism-invariant functional integral over scalar functions. The construction defines a covariant, Feynman-like, spacetime formalism for quantum gravity and relates this theory to the spin foam models. We also discuss how expectation values of the physical quantity can be computed.
- Received 2 November 1998
DOI:https://doi.org/10.1103/PhysRevD.59.104015
©1999 American Physical Society