- 149

- 41

I was just assuming it holds for the sake of @Auto-Didact's argument, and trying to argue that it's irrelevant as a way to rule out unitary QM holding exactly.Can you point to a theorem proving a recurrence theorem in the quantum case?

Poincaré recurrence is for finite-dimensional bounded dynamical systems only. Already a single hydrogen atom violates both assumptions, let alone the universe.