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Some Remarks on the Semi-Classical Limit of Quantum Gravity
the Semi-Classical Limit Quantum Gravity
2010/10/13
One of the most important issues in quantum gravity is to identify its semi-classical regime. First the issue is to define for we mean by a semi-classical theory of quantum gravity, then we would like...
The Feynman Propagator for Quantum Gravity: Spin Foams, Proper Time, Orientation, Causality and Timeless-Ordering
Quantum Gravity Spin Foams Proper Time Orientation Causality Timeless-Ordering
2010/10/14
We discuss the notion of causality in Quantum Gravity in the context of sum-over-histories approaches, in the absence therefore of any background time parameter. In the spin foam formulation of Quantu...