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The Quantum Mechanics of Minds and Worlds$
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Jeffrey A. Barrett

Print publication date: 2001

Print ISBN-13: 9780199247431

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780199247431.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 23 September 2021

Many Worlds

Many Worlds

(p.149) 6 Many Worlds
The Quantum Mechanics of Minds and Worlds

Jeffrey Alan Barrett

Oxford University Press

This chapter explains the many-worlds interpretations, particularly the DeWitt–Graham interpretation — the splitting-worlds interpretation. The splitting-worlds theory proposes that one must choose what physical quantities one wants to be determinate in a world, which amounts to choosing a physically preferred basis. It discusses several traditional and real problems encountered with the splitting-worlds theory. It also describes another theory, where one might stipulate that the global state always evolves in the usual linear way, selects a preferred basis that makes observers' records always determinate in each local state, and then chooses a connection rule that will link local states at different times into trajectories — the many threads theory.

Keywords:   many-worlds theory, splitting-worlds theory, DeWitt–Graham theory, Bryce DeWitt, Neill Graham, physical quantities, global state, many threads theory

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