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A Question For Physicists
Posted: Mon Jul 06, 2009 9:01 am
by MSimon
I'm slightly familiar with quantum entanglement.
If the Big Bang theory is true why aren't all particles in existence entangled?
Re: A Question For Physicists
Posted: Mon Jul 06, 2009 1:26 pm
by rcain
MSimon wrote:I'm slightly familiar with quantum entanglement.
If the Big Bang theory is true why aren't all particles in existence entangled?
who says they aren't?
have they observed them all?
Re: A Question For Physicists
Posted: Mon Jul 06, 2009 5:12 pm
by MSimon
rcain wrote:MSimon wrote:I'm slightly familiar with quantum entanglement.
If the Big Bang theory is true why aren't all particles in existence entangled?
who says they aren't?
have they observed them all? ;)
I think that can be falsified by noting that at least in our local area of the universe it takes special effort to produce entanglement.
Posted: Mon Jul 06, 2009 6:30 pm
by chrismb
Is this not to do with the issue of conserved quantum [angular] momentum?... at the 'moment of the big bang' (I've a different suggestion, but I'll presume it is the case for the purposes of this post) whatever it was that was created had some finite quantum momentum total for the universe. Thereafter you have a different question - when particles are created, so the quantum angular momentum must remain the same.
In other words - all particles that are curently in existence, and have been since the big bang, *are* entangled with each other, but those created since then have, themselves, been created at some instant and location in which there is specific entanglement with (an)other particle(s).
Re: A Question For Physicists
Posted: Tue Jul 07, 2009 12:55 am
by gblaze42
MSimon wrote:I'm slightly familiar with quantum entanglement.
If the Big Bang theory is true why aren't all particles in existence entangled?
Personally I would think it's a matter of de-coherence. It's rather hard to keep entanglement more than a millisecond.
Posted: Tue Jul 07, 2009 6:05 am
by pfrit
If you follow the copenhagen interpretation of QM, then all the entanglements broke on their own almost immediately. If you follow the many worlds interpretation, it just appears to us in our quantum state that the collapsed. The event cone continues in that case. Either way they do not appear connected to us now. And since there is no realistic way of differentionating the two states, it makes no difference. OTOH, the copenhagen interpretation is boring.
