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gr-qc2008★ 67 cited
Constraints and gauge transformations: Dirac's theorem is not always valid
Julian Barbour, Brendan Z. Foster
A standard tenet of canonical quantum gravity is that evolution generated by a Hamiltonian constraint is just a gauge transformation on the phase space and therefore does not chang…
gr-qc2004★ 8 cited
A first-principles derivation of York scaling and the Lichnerowicz-York equation
Edward Anderson, Julian Barbour, Brendan Z. Foster +2
The only efficient and robust method of generating consistent initial data in general relativity is the conformal technique initiated by Lichnerowicz and perfected by York. In the…
gr-qc1999
Classical and Quantum Gravity on Conformal Superspace
Julian Barbour, Niall O Murchadha
The four-dimensional gauge group of general relativity corresponds to arbitrary coordinate transformations on a four-manifold. Theories of gravity with a dynamical structure remark…