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The conventionality of geometry is merely incomplete

Roberts, Bryan W. (2025) The conventionality of geometry is merely incomplete. [Preprint]

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Abstract

Empiricists following Poincaré have argued that spacetime geometry can be freely chosen by convention, while adjusting unobservable structure so as to maintain empirical adequacy. In this article, I first prove two no-go results against the conventionality of geometry, which strengthen known results in the literature, and then argue that any remaining conventionality arises from scientific incompleteness. To illustrate, I discuss a new kind of conventionality that is available in the presence of higher spatial dimensions, and illustrate how the incompleteness in such models can be resolved by introducing new physical theories like Kaluza-Klein theory. Conventional choices of this kind may provide a fruitful starting point in the search for new science, but if successful would eliminate the conventionalist alternatives.


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Item Type: Preprint
Creators:
CreatorsEmailORCID
Roberts, Bryan W.b.w.roberts@lse.ac.uk0000-0003-0548-1280
Additional Information: Forthcoming in Philosophy of Science
Keywords: conventionality of geometry, philosophy of space and time, philosophy of physics
Subjects: Specific Sciences > Mathematics > Ontology
Specific Sciences > Physics
General Issues > Realism/Anti-realism
Specific Sciences > Physics > Relativity Theory
Depositing User: Bryan W. Roberts
Date Deposited: 17 Oct 2025 11:03
Last Modified: 17 Oct 2025 11:03
Item ID: 26951
Subjects: Specific Sciences > Mathematics > Ontology
Specific Sciences > Physics
General Issues > Realism/Anti-realism
Specific Sciences > Physics > Relativity Theory
Date: 1 April 2025
URI: https://philsci-archive.pitt.edu/id/eprint/26951

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