Time, Gauge, and the Superposition Principle in Quantum Gravity


The quantization of time-reparametrization invariant systems such as general relativity is plagued by an ambiguity relating to the role of time in the theory. If one parametrizes observables by the (unobservable) time, and then relies on the existence of an approximate " clock " degree of freedom to give physical meaning to the observables, one finds… (More)


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