Einstein's Train in Fragmentalist Presentism


It is often thought the relativity of simultaneity is inconsistent with presentism. This would be troubling as it conflicts with common sense and—arguably—the empirical data. This note gives a novel fragmentalist-presentist theory that allows for the (non-trivial) relativity of simultaneity. A detailed account of the canonical moving train argument is considered. Alice, standing at the train station, forms her own ontological fragment, in which Bob’s frame of reference, given by the moving train, is modified by the Lorentz transformations. On the other hand, Bob, in the train, forms his own ontological fragment from which Alice’s space and time are modified by the corresponding Lorentz transformations. Each fragment accommodates a unique present moment but does not contain information about the unique present moment of another fragment. This allows for a ‘universal’ present moment that extends throughout space, but only from the perspective of each fragment. The relativity of simultaneity is, as it were, ‘relativised’ to each fragment. This is related to the idea that, roughly speaking, the time of relativity is McTaggart’s (1908) B-series (earlier times to later times) and the time of quantum mechanics is a (fragmentalist) A-series (future/present/past), where these two related series characterize one dimension of time.



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References found in this work

Tense and reality.Kit Fine - 2005 - In Modality and Tense: Philosophical Papers. Oxford, England: Oxford University Press. pp. 261--320.
Is the World a Heap of Quantum Fragments?Samuele Iaquinto & Claudio Calosi - 2021 - Philosophical Studies 178:2009-2019.
On the electrodynamics of moving bodies.Albert Einstein - 1920 - In The Principle of Relativity. [Calcutta]: Dover Publications. pp. 35-65.
Explaining Temporal Qualia.Matt Farr - 2020 - European Journal for Philosophy of Science 10 (1):1-24.
Fragmenting the Wave Function.Jonathan Simon - 2018 - Oxford Studies in Metaphysics 11:123-148.

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