Interacts..obervation is not ghostly.Canute said:An observation acts causally?
There is no firm reason to suppose that.I can never quite get the hang of what QM says about this. Does it have to be a conscious observation?
If observation means interaction with a piece of apparatus it is not a problem.How does the observation of the new state of the system cause that state? Until we observe the system in that new state then it is not observable in that state. That is, it takes a finite time for information to travel from what is being observed to the observer. This means that to observe a selected eigenvalue that eigenvalue must have already been selected prior to the observation. How is this explained in QM?