The role of the observer in the Everett interpretation
arXiv:1211.0196
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.
v2-6: new abstract; further comments and references added; v3: published; v6: 14 pages