Abstract
This is a brief account of coherent states, Wigner functionals, decoherence, environments and whether physics is only about subsystems, in support of many of the book’s chapters on quantum cosmology, histories and records.
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In fact, Crane [225] considers defining observers as boundaries of localized regions. Though clearly not all such boundaries will have observes realized upon them. Also, sizeable boundaries would need to be populated by many observers, forming a ‘shell of observers’ or a ‘shell array of detectors’. The Information Gathering and Utilizing System concept may help as regards practically realizing such shells.
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Anderson, E. (2017). Semiclassicality and Quantum Cosmology: Interpretative Issues. In: The Problem of Time. Fundamental Theories of Physics, vol 190. Springer, Cham. https://doi.org/10.1007/978-3-319-58848-3_48
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