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The nature of time in a closed system

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If you have a question about this talk, please contact Jeremy Nicholas Butterfield.

That time evolution appears frozen is not only a consequence of quantum gravity but appears in any theory where one tries to quantise a closed system. In such a system, time is no longer a parameter, but is represented by entanglement. This strengthens the view that our physical theories are incapable of describing time. Furthermore, the fact that time is represented by entanglement leads to a second interpretational issue related to that found in measurement theory (and in contradiction to it). I’ll also discuss whether one can have a memory in such a system, relationalism, energy conservation, and whether one can even measure the time ordering of two events.

This talk is part of the Philosophy of Physics series.

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