15 So overall, one gets a factor ( −1)2j for each link sur- rounded by nodes of the same sign

Reversing the arrow of a link in-between a positive, a negative link does not change the vertex amplitude

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gr-qc · 2021-09-02 · unverdicted · novelty 5.0

Proposes a causal EPRL spin-foam model where the two-complex orientation encodes causality and aids semiclassical geometry reconstruction.

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Causal structure in spin-foams gr-qc · 2021-09-02 · unverdicted · none · ref 27
Proposes a causal EPRL spin-foam model where the two-complex orientation encodes causality and aids semiclassical geometry reconstruction.