On 1/6/2014 8:16 AM, John Clark wrote:
On Sun, Jan 5, 2014 at 4:11 PM, LizR <lizj...@gmail.com
<mailto:lizj...@gmail.com>> wrote:
On 6 January 2014 06:47, John Clark <johnkcl...@gmail.com
<mailto:johnkcl...@gmail.com>> wrote:
>>> Bell's theorem holds only under a certain set of assumptions,
>>True. As I've said many times Bell made exactly 3 assumptions:
1) High School algebra and trigonometry works.
2) Things are local.
3) Things are realistic.
> In fact Bell made a fourth assumption, although he didn't realise he was
making it
until later. Namely, he assumed that time is asymmetric.
I won't bother to argue if Bell made this assumption or not because it doesn't matter,
time is asymmetric.
> 4) Time is asymmetric not just at the level of everyday experience, but
also at
the quantum level
Bell's 4th assumption seems to me quite a reasonable one to drop, given
that most
physics contradicts it.
That is incorrect, most physics does NOT contradict time's asymmetry, thermodynamics and
cosmology certainly don't. Yes Quantum Mechanics seems to be time symmetrical but even
if Quantum Mechanics tells the whole story (and we know for a fact that it doesn't
because it doesn't include gravity) time could still be asymmetric because how a system
evolves over time depends not only on the rules of the game (Quantum Mechanics) but
also on the initial conditions.
But if QM without collapse is fundamental, then the dynamics are time (really CPT)
symmetric and all the observed asymmetry is a statistical effect due to starting in low
entropy initial conditions. Bell derived his inequality assuming QM with collapse, i.e.
he assumed this time asymmetry was fundamental, not a mere statistical effect related to
the low entropy of the initial conditions of the experiment.
Brent
The universe started out in an extremely low entropy state, probably the lowest entropy
state possible, so whatever the true laws of physics are, that is to say whatever the
rules of the game are, it wouldn't change the fact that there are just more ways to be
disordered than ordered. So as the game plays out entropy increases and time has a
direction regardless of what the rules of the game are.
John K Clark
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