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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...