Abstract
The relevance of observations in introducing time dependence into quantum cosmology is discussed, some of the important features being illustrated by a simple example. Although the concept of time arises in a natural way even with a constant wave function, there are some conceptual difficulties in understanding how arguments which are familiar in classical cosmology translate to the quantum case.
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Collins, P.D.B., Squires, E.J. Time in a quantum universe. Found Phys 23, 913–921 (1993). https://doi.org/10.1007/BF01891514
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DOI: https://doi.org/10.1007/BF01891514