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Samuel Kimpton-Nye, The Nature of Contingency: Quantum Physics as Modal Realism, The Philosophical Quarterly, Volume 71, Issue 2, April 2021, Pages 444–447, https://doi.org/10.1093/pq/pqaa043
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In The Nature of Contingency, Alastair Wilson defends quantum modal realism (QMR), an account of modality in terms of the many worlds of Everettian quantum mechanics (EQM).
The central principles of QMR are:
Alignment: To be a metaphysically possible world is to be an Everett world.
Indexicality-of-Actuality: Each Everett world is actual according to its own inhabitants, and only according to its own inhabitants. (p. 22)
An Everett world ‘is a global quantum-mechanical sequence of events, and the key theoretical device of modern EQM” and “there is an Everett world for every quantum-mechanically possible sequence of events’ (p. 23).
Why take individual Everett worlds to be metaphysically possible worlds rather than taking the whole Everettian pluriverse to be one metaphysically possible world among others? This is tantamount to asking why we should adopt QMR; Wilson thinks we should adopt QMR on the basis of its theoretical virtues. The arguments of Chapter 1, according to which QMR enjoys at least those theoretical virtues enjoyed by Lewisian Modal Realism (LMR) (Lewis 1986), are thus particularly important.