Time asymmetries in quantum cosmology and the search for boundary conditions to the Wheeler-DeWitt equation. (English summary) Classical Quantum Gravity 19 (2002), no. 18, 4729–4746. The so-called “problem of time ” in quantum gravity is one of the main conceptual and technical problems of the canonical quantization procedure. In this paper the authors address the quantization of minisuperspace models by studying a possible solution to the problem of time and time asymmetries in quantum cosmology. By means of a choice of physical clock they achieve the breaking of clock-reversal invariance, therefore relating it to the issue of imposing boundar
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