On 11-11-2019 22:44, Alan Grayson wrote:
On Monday, November 11, 2019 at 4:35:13 AM UTC-7, Bruce wrote:
On Mon, Nov 11, 2019 at 8:37 PM Bruno Marchal <mar...@ulb.ac.be>
wrote:
On 10 Nov 2019, at 20:01, Alan Grayson <agrays...@gmail.com>
wrote:
On Sunday, November 10, 2019 at 5:42:50 AM UTC-7, Bruno Marchal
wrote:
Once the cat is alive + dead, he remains in that state for ever.
THEN HOW COME WE NEVER OBSERVE THAT STATE? AG
Because the observable are defined by their possible definite outcome,
and for reason already explained, macroscopic superposition decoder,
that is get entangled with the environment at a very high speed. So,
if you look at the cat in the a+d state, you are duplicate almost
immediately into a guy seeing the cat alive + the guy seeing the cat
dead, and QM explained why they cannot interact, although they might
interfere themselves.
That is exactly a preferred basis -- which you seem to want to deny.
Bruce
In the case of a radioactive atom in state |decayed> + |undecayed>,
what's the justification and advantage of the interpretation that it's
in both states simultaneously? AG
This is what happens, as confirmed by experiment. In case the decay
happens fast and there is more than one decay channel, the decay will
happen to a superposition of the different possibilities. It's then not
a decay to one of the possibilities and we just don't know which one.
The difference between the two scenarios has in principle experimentally
verifiable consequences. For example, the Delta++ particle decays to a
proton and a positive pion due to the strong interaction. The strong
interaction obeys isospin symmetry. From this one can deduce by applying
a rotation in isospin space that the delta+ particle should decay to the
superposition sqrt(1/3)|n>|pi+> + sqrt(2/3)|p>|pi0> where |n> denotes a
neutron|p> a proton and |pi0> and |pi+> are neutral and positive pions.
Experiments have confirmed the relative decay probabilities of 1/3 and
2/3.
Saibal
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