Everett and the Born rule

Alastair Rae

Research output: Contribution to journalArticle

10 Citations (Scopus)


During the last 10 years or so, derivations of the Born rule based on decision theory have been proposed and developed, and it is claimed that these are valid in the context of the Everett interpretation. This claim is critically assessed and it is shown that one of its key assumptions is a natural consequence of the principles underlying the Copenhagen interpretation, but constitutes a major additional postulate in an Everettian context. It is further argued that the Born rule, in common with any interpretation that relates outcome likelihood to the expansion coefficients connecting the wavefunction with the eigenfunctions of the measurement operator, is incompatible with the purely unitary evolution assumed in the Everett interpretation. (C) 2009 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)243-250
Number of pages8
JournalStudies In History and Philosophy of Science Part B Studies In History and Philosophy of Modern Physics
Issue number3
Publication statusPublished - 1 Aug 2009


  • Born rule
  • Everett
  • Quantum measurement


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