Panderos wrote:
Bit beyond me really. Would the takeaway for the thread be that particles are really interacting even before any measurement is made upon them? Then what was with J-A-K's statement about the moon not being there when you don't look?
LOL I've forgotten exactly what he said now, and it would take some time to find it! It is quite difficult to isolate things from their environment so yes, to this extent they're always interacting, and decoherence is taking place. The moon isn't an isolated system, so it decoheres quite nicely and looks pretty classical. One of the big deals is what basis you end up diagonal (i.e. no quantum type correlations) in - I believe there are arguments for the position basis being one of these, so the moon has a well defined classical position. Which came in quite handy in 1969!
This is a paper I read a couple of years ago on these topics - IIRC it's quite a readable account:
http://arxiv.org/abs/quant-ph/0501119