If David Deutsch is correct, splitting is slower than or at lightspeed, and doesn't cause whole universes to diverge (he also says universes are only approximations anyway, iirc). In his view there are "bubbles" which have split, embedded in larger regions which haven't (at least for a given source of decoherence). Presumably these bubbles can intersect, and the metaphor breaks down...
The process is irreversible in most cases and for all practical purposes, although a qc would be an example of splitting a region of the multiverse temporarily, then bringing the "parallel" regions back together again. Presumably there is some reversal at the microscopic level, since the underlying physics is (I assume) time-symmetric. -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
