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Spacetime Coarse Grainings and the Problem of Time in the Decoherent Histories Approach to Quantum Theory

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Abstract

We investigate the possibility of assigning consistent probabilities to sets of histories characterized by whether they enter a particular subspace of the Hilbert space of a closed system during a given time interval. In particular we investigate the case that this subspace is a region of the configuration space. This corresponds to a particular class of coarse grainings of spacetime regions. We consider the arrival time problem, as a warm up, to deal with the problem of time in reparametrization invariant theories (as for example in canonical quantum gravity) which subsequently we examine. Decoherence conditions and probabilities for those application are derived. The resulting decoherence condition does not depend on the explicit form of the restricted propagator that was problematic for generalizations such as application in quantum cosmology. Closely related to our results, is the problem of tunnelling time as well as the quantum Zeno effect. Some interpretational comments conclude, and we discuss the applicability of this formalism to deal with the arrival time problem and the problem of time in general.

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  1. Theoretical Physics Group, Raman Research Institute, Sadashivanagar, Bangalore, 560 080, India

    Petros Wallden

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Wallden, P. Spacetime Coarse Grainings and the Problem of Time in the Decoherent Histories Approach to Quantum Theory. Int J Theor Phys 47, 1512–1532 (2008). https://doi.org/10.1007/s10773-007-9592-y

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