The structure of the multiverse

The structure of the multiverse can be understood by analysing the ways in which information can flow in it. We may distinguish between quantum and classical information processing. In any region where the latter occurs — which includes not only classical computation but also all measurements and decoherent processes — the multiverse contains an ensemble of causally autonomous systems, each of which resembles a classical physical system. However, even in those regions, the multiverse has additional structure.