As you hint at the end of your essay, there are some arguments against time as the reading of a clock:1. Clock time is only defined on the clock's worldline. 2. Reading time means measuring the location of a dial. But then you have no idea what the dial's speed is, since Heisenberg tells us that[x, v] = i hbar/M,where M is the clock's (or dial's) mass.3. You can avoid this uncertainty by letting the clock's mass go to infinity. In the presence of gravity, the clock will then immediately collapse into a black hole.In arXiv:0811.0900v1 [hep-th] I took these objections seriously, and introduced a generalization of QFT which does not only describe the quantized fields, but also a physical observer with quantum dynamics.
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