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Directed theories of time and the conventionality of simultaneity

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Directed theories of time maintain that time has an objective ‘future’ direction. In this talk, I illustrate a sense in which such theories are incompatible with special relativity. My conclusion follows almost immediately from a particular choice simultaneity relation for a uniformly accelerated observer. I prove that, in a certain natural sense stemming from the work of Malament (1977), this is the unique simultaneity relation available to such observers.

This talk is part of the Departmental Seminars in History and Philosophy of Science series.

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