Abstract
Discussions of the metaphysical status of spacetime assume that a spacetime theory offers a causal explanation of phenomena of relative motion, and that the fundamental philosophical question is whether the inference to that explanation is warranted. I argue that those assumptions are mistaken, because they ignore the essential character of spacetime theory as a kind of physical geometry. As such, a spacetime theory does notcausally explain phenomena of motion, but uses them to construct physicaldefinitions of basic geometrical structures by coordinating them with dynamical laws. I suggest that this view of spacetime theories leads to a clearer view of the philosophical foundations of general relativity and its place in the historical evolution of spacetime theory. I also argue that this view provides a much clearer and more defensible account of what is entailed by realism concerning spacetime.
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I would like to thank William Demopoulos and Michael Friedman for their comments on earlier drafts. I also thank the anonymous referees forErkenntnis for their suggestions. Work on this paper was supported by the Social Sciences and Humanities Research Council of Canada.
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Disalle, R. Spacetime theory as physical geometry. Erkenntnis 42, 317–337 (1995). https://doi.org/10.1007/BF01129008
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DOI: https://doi.org/10.1007/BF01129008