Jacobs, Caspar and March, Eleanor
(2025)
Kinematical Equivalence and Cosmic Conspiracies.
[Preprint]
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Abstract
Discussions of theoretical equivalence typically only concern a theory's dynamically possible models. Recently, however, March (2024) has shown that a theory's kinematically possible models are also relevant to questions of theoretical equivalence. We apply March's notion of kinematic equivalence to the difference between reduced and sophisticated theories introduced by Dewar (2019). Although Dewar claims that these are equivalent, Jacobs (2024) has argued that only sophisticated theories can explain what are otherwise 'cosmic conspiracies'. We show that this is a consequence of reduced and sophisticated theories' kinematical inequivalence. Furthermore, we use Caulton's (2024) 'downwards Hume's dictum' to show that kinematically inequivalent are also ontologically inequivalent.
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