Emergent Semiclassical Time in Quantum Gravity. Full Geometrodynamics and Minisuperspace Examples

Details Emergent Semiclassical Time in Quantum Gravity. Full Geometrodynamics and Minisuperspace Examples Emergent Semiclassical Time in Quantum Gravity. Full Geometrodynamics and Minisuperspace Examples

2006-11-01

arxiv.org/abs/gr-qc/0611008v2

Class.Quant.Grav.24:2979-3004,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

References Updated

Scientific paper

10.1088/0264-9381/24/11/012

I apply the preceding paper's semiclassical treatment to geometrodynamics. The analogy between the two papers is quite useful at the level of the quadratic constraints, while I document the differences between the two due to the underlying differences in their linear constraints. I provide a specific minisuperspace example for my emergent semiclassical time scheme and compare it with the hidden York time scheme. Overall, interesting connections are shown between Newtonian, Leibniz--Mach--Barbour, WKB and cosmic times, while the Euler and York hidden dilational times are argued to be somewhat different from these.

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