Editing Causality (physics) (section)

==Causal sets==
{{main|Causal sets}}
In causal set theory, causality takes an even more prominent place. The basis for this approach to quantum gravity is in a theorem by [[David Malament]]. This theorem states that the [[causal structure]] of a spacetime suffices to reconstruct its [[conformal class]], so knowing the conformal factor and the causal structure is enough to know the spacetime. Based on this, [[Rafael Sorkin]] proposed the idea of Causal Set Theory, which is a fundamentally discrete approach to quantum gravity. The causal structure of the spacetime is represented as a [[poset]], while the conformal factor can be reconstructed by identifying each poset element with a unit volume.