Some Worlds of Quantum Theory

TL;DR

This paper critically examines the Everettian interpretation of quantum mechanics, focusing on its conceptual and metaphysical aspects, especially the notion of 'branch' and the role of decoherence, questioning the acceptance of imprecise definitions.

Contribution

It provides a philosophical analysis of the Everettian approach, highlighting issues related to the definition of 'branch' and the significance of decoherence in the interpretation.

Findings

Questions the acceptability of no precise 'branch' definition

Highlights the importance of decoherence in the Everettian approach

Provides a philosophical critique of the measurement problem solution

Abstract

This paper assesses the Everettian approach to the measurement problem, especially the version of that approach advocated by Simon Saunders and David Wallace. I emphasise conceptual, indeed metaphysical, aspects rather than technical ones; but I include an introductory exposition of decoherence. In particular, I discuss whether -- as these authors maintain -- it is acceptable to have no precise definition of 'branch' (in the Everettian kind of sense).