General Relativity and Quantum Cosmology
We model the classical transmission of a massless scalar field from a source to a detector on a background causal set. The predictions do not differ significantly from those of the continuum. Thus, introducing an intrinsic inexactitude to lengths and durations - or more specifically, replacing the Lorentzian manifold with an underlying discrete structure - need not disrupt the usual dynamics of propagation.
Dowker, Fay; Henson, Joe; and Sorkin, Rafael, "Discreteness and the Transmission of Light from Distant Sources" (2010). Physics. 23.
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