The role of the observer in the Everett interpretation

TL;DR

This paper examines the observer's role in quantum mechanics, especially in the Everett interpretation, highlighting differences between quasi-classical and macroscopically given states and their implications for understanding measurement.

Contribution

It clarifies the observer's role in the Everett interpretation and distinguishes between quasi-classical and macroscopically given states in quantum theory.

Findings

Highlights the importance of decoherence in the Everett interpretation

Distinguishes between quasi-classical and macroscopically given states

Discusses implications for the role of the observer in quantum mechanics

Abstract

The role attributed to the observer in various interpretations of quantum mechanics as well as in classical statistical mechanics is discussed, with particular attention being paid to the Everett interpretation. In this context, the important difference between "quasi-classical" (robust against decoherence) and "macroscopically given" (rather than being part of a thermodynamic ensemble) is pointed out.