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We have several models of discrete spacetime. Sorkin has a causal growth dynamics, there's spin foams, Panangaden showed a correspondence between interval domains and spacetimes. I am looking for anything that looks like the Einstein equation. Specifically, what are some required properties of a morphism of a spacetime (however it is modelled)?

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  • $\begingroup$ A non-trivial model of "something" has to be able to predict some non-trivial properties of "something". What, exactly, can these things predict? $\endgroup$ – CuriousOne Jul 2 '15 at 23:08

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