Agreed.A measurement can be the same thing as an observable in physics. A measurement is the act of observing a system to collect data...
That would seem axiomatic based on the above, yes....in quantum mechanics, the only things which can be measured in the quantum sense are observables... which are any physical attributes about a system.
Do you have a reference for that? Given that you can read the time off a clock just as easily as you can read the mass of an object from a scale, it is tough to see why you don't believe that time is observable.But the interesting thing, is that time is not an observable...
What do you mean by "physical thing"? Time isn't an object like a rock, it is a dimension, like length. It's physicality is very much like that of length. And it most certainly is clearly defined....it's not defined as a real physical thing.
Why would that prove it? I use the equation d=s*t every day (most people do even if they are unaware of it) without representing it as a Hermitian matrix. It doesn't seem to me like that has any relevance here.If it was, it would need to be represented as a Hermitian matrix to prove it is a real thing and that it can be measured.
What is "global time evolution" and how is it described in GR? That sentence really appears self-contradictory: like you are saying that time is described without time.No because global time evolution isn't described in general relativity by a time-parameter. It is in fact subject to diffeomorphism invariance and General Covariance which leads to evolution arising as a symmetry of the theory. It's not a true time evolution, it doesn't have time in it.
The link I provided shows GR-based equations with "time" terms (such as proper [elapsed] time, coordinate time, etc.). It doesn't seem to make any sense to me to say there is no time in GR when it sure looks like is all over the place in GR.