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Causal spin foams

Giorgio Immirzi
(
- Unlisted, IT
)

Oct 14, 2016

7 pages

e-Print:

1610.04462 [gr-qc]

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Abstract: (arXiv)

I discuss how to impose causality on spin-foam models, separating forward and backward propagation, turning a given triangulation to a 'causal set', and giving asymptotically the exponential of the Regge action, not a cosine. I show the equivalence of the prescriptions which have been proposed to achieve this. Essential to the argument is the closure condition for the 4-simplices, all made of space-like tetrahedra.

Note:

7 pages, 1 figure; rewritten, perhaps improved

action: Regge
spin: foam
causality
triangulation
propagator
causal set
simplex
quantum gravity
Ponzano-Regge model

References(28)

Figures(0)

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