Speaker: Philip Hoehn
Place: 241 Nicholson
Date: 14.03.198
Time: 10:30 AM
Title: From quantum reference systems to quantum general covariance
Abstract: Reference frames (or, more generally, systems) provide the vantage points from which to describe the remaining physics. Treating them fundamentally as quantum systems is inevitable in quantum gravity, where coordinates are a priori unavailable, but also in quantum
foundations once accepting that all frames are physical systems. Both fields thus face the question of how to describe physics from the
perspective of quantum reference systems and how the descriptions relative to different such choices are related. I will summarize a recent systematic method for such switches, which works in analogy to
coordinate changes on a manifold, except that these `quantum coordinate changes' proceed between different Hilbert spaces. This method relies on a new quantum reduction procedure, relating Dirac and reduced
quantization, sets the stage for a quantum version of general covariance and applies to both temporal and spatial reference systems. In
particular, I will illustrate how one can use this method to switch between different relational clocks in the quantum theory and thereby address the so-called "multiple choice problem of time". (Based on
arXiv:1809.00556, 1809.05093, 1810.04153, 1811.00611.)
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