Understanding Deutsch's probability in a deterministic universe

Abstract
Difficulties over probability have often been considered fatal to the Everett interpretation of quantum mechanics. Here I argue that the Everettian can have everything she needs from `probability' without recourse to indeterminism, ignorance, primitive identity over time or subjective uncertainty: all she needs is a particular *rationality principle*. The decision-theoretic approach recently developed by Deutsch and Wallace claims to provide just such a principle. But, according to Wallace, decision theory is itself applicable only if the correct attitude to a future Everettian measurement outcome is subjective uncertainty. I argue that subjective uncertainty is not to be had, but I offer an alternative interpretation that enables the Everettian to live without uncertainty: we can justify Everettian decision theory on the basis that an Everettian should *care about* all her future branches. The probabilities appearing in the decision-theoretic representation theorem can then be interpreted as the degrees to which the rational agent cares about each future branch. This reinterpretation, however, reduces the intuitive plausibility of one of the Deutsch -Wallace axioms.
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DOI 10.1016/j.shpsb.2004.04.006
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References found in this work BETA
Survival and Identity.David Lewis - 1976 - In Amelie Oksenberg Rorty (ed.), The Identities of Persons. University of California Press. pp. 17-40.
Everett and Structure.David Wallace - 2003 - Studies in History and Philosophy of Science Part B 34 (1):87-105.
Belief and the Will.C. van Fraassen - 1984 - Journal of Philosophy 81 (5):235-256.

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Citations of this work BETA
Quantum Probability From Subjective Likelihood: Improving on Deutsch's Proof of the Probability Rule.David Wallace - 2007 - Studies in History and Philosophy of Science Part B 38 (2):311-332.
Branching and Uncertainty.Simon Saunders & D. Wallace - 2008 - British Journal for the Philosophy of Science 59 (3):293-305.
Measurement Outcomes and Probability in Everettian Quantum Mechanics.David Baker - 2007 - Studies in History and Philosophy of Science Part B 38 (1):153-169.
Probability in the Everett Interpretation.Hilary Greaves - 2007 - Philosophy Compass 2 (1):109–128.
Uncertainty and Probability for Branching Selves.Peter J. Lewis - 2007 - Studies in History and Philosophy of Science Part B 38 (1):1-14.

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