January 28, 2013
Perhaps you wondered why nothing was happening on this blog in recent months and the answer is, of course, that nothing happens in the universe in general.
In other words, this is just another post about the Everett interpretation, but this time(!) the focus is not on the problem with probabilities, but rather the issue of factorization and basis selection.
"It is interesting that the factorization problem has received so little attention. Most authors focused on the part of the basis problem which is solved by decoherence. Only few authors have noticed that the factorization problem is a serious threat to the Everett interpretation.
I think the reason is mainly that in almost all situations occurring in practice, the subsystems are already given (particles, cats, ...). " (*)
So then we have to ask why there is a blog and why it seem as if something is about to happen...
(*) A while ago I raised a similar issue (I think): "..decoherence usually considers a quantum system coupled to its environment. But the very existence of such an environment is dubious.."