Say we have a state vector |A⟩. Is it possible to have a theory where the evolution of |A⟩ depends on the vector |A⟩ itself? e.g.
i∂∂tψ(t)=ˆF(ψ(t))ψ(t)
On reason I was thinking about this was the idea that space-time is related to entanglement. But entanglement means knowledge of the state-vector. So if this were true, the state-vector would have to affect itself.
In other words is non-linear quantum mechanics possible?
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