Møller-Rosenfeld semiclassical gravity, which averages over quantum mixtures, is argued to be a different theory from the semiclassical limit of unitary quantum gravity, which would collapse to a single branch after a gravitational measurement.
Alice observes a test massMini- tially at spacetime point (y, t′)
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Mixture equivalence principles and post-quantum theories of gravity
Møller-Rosenfeld semiclassical gravity, which averages over quantum mixtures, is argued to be a different theory from the semiclassical limit of unitary quantum gravity, which would collapse to a single branch after a gravitational measurement.