Probability, self-location, and quantum branching

Peter J. Lewis

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The main problem with the many-worlds theory is that it is not clear how the notion of probability should be understood in a theory in which every possible outcome of a measurement actually occurs. In this paper, I argue for the following theses concerning the many-worlds theory: (1) If probability can be applied at all to measurement outcomes, it must function as a measure of an agent's self-location uncertainty. (2) Such probabilities typically violate reflection. (3) Many-worlds branching does not have sufficient structure to admit self-location probabilities. (4) Decision-theoretic arguments do not solve this problem.

Original languageEnglish (US)
Pages (from-to)1009-1019
Number of pages11
JournalPhilosophy of Science
Issue number5
StatePublished - Dec 2010

ASJC Scopus subject areas

  • History
  • Philosophy
  • History and Philosophy of Science


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