The traditional absolutist-relationist controversy about space and time conflates four distinct issues: existence, abstraction, relationality and relativity. Terms which are relational, relative or abstract may denote items which possess contingent properties. Possession of such properties, including topological and geometrical properties, is therefore no indication of logical type. To fail to recognise the possibility of spaces, times and space-times of various logical types is to risk conflating two distinct ontological issues: a metaphysical issue concerning the existence of abstract objects and a (...) question of physics concerning the existence of causally efficacious substrata which may or may not be needed to explain the contingent properties of the abstract objects. (shrink)

The debate on the ontological status of spacetime in General Relativity has historically seen two principal philosophical contenders: substantivalism, roughly the view that holds that spacetime exists apart from the material contents of the universe, and relationism, the doctrine that spacetime does not exist, i.e., it is a mere abstract web of spatiotemporal relations among bodies. This dispute, however, has rarely been fought on a cosmological battlefield. In this paper an attempt in this direction is made. The question at issue (...) is the following: is there any feature of our universe that requires or is best explained in terms of a substantival space? I claim that there is indeed: the expansion of the universe, perhaps the most important phenomenon in cosmology, can play such a role. (shrink)