The World as Wavefunction

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Tappenden, Paul
preprint description
Murray Gell-Mann and James Hartle have made an original proposal for a version of decoherent histories quantum mechanics which is specifically tailored so as not to imply the emergence of multiple quasi-classical worlds. I argue that there is an explanatory gap in the proposal but that there remains an important insight. That insight might be used to tackle what can be seen as an outstanding problem for Hugh Everett III’s ‘“relative state” formulation’ of quantum mechanics. At least, so long as that view is understood to give ontic priority to the wavefunction. The argument employs a recent novel analysis of self-location within any sort of multiverse, which also suggests a solution to the cosmological measure problem.