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Projection Operator and Feynman Propagator for a Free Massive Particle of Arbitrary Spin
free massive particle arbitrary spin projection operator Feynman propagator
2007/8/15
2004Vol.41No.3pp.405-418DOI:
Projection Operator and Feynman Propagator for a Free Massive Particle of Arbitrary Spin
HUANG Shi-Zhong,1,3 ZHANG Peng-Fei,2,3 RUAN Tu-Nan,2,3 ZHU Y...
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...
