On 14/08/2017 2:51 am, Stathis Papaioannou wrote:
On Sun, 13 Aug 2017 at 9:38 pm, Bruce Kellett
<[email protected] <mailto:[email protected]>> wrote:
I think the problem I see is in the insistence that one restrict
the subjects of the duplication to first person knowledge. Their
knowledge of the protocol cannot be purely 1p -- there has to be a
3p component in that they are told the set up, and they have
sufficient background 3p knowledge to trust the operator, etc.
Then, after duplication, they also have access to 3p knowledge
about both duplicates -- they can arrange to communicate, for
example. So they can easily become aware of the fact that the
person that remembers being Helsinki man sees both Moscow and
Washington. My point here is that if you restrict them to 1p
knowledge after the duplication, you must, in order to be
consistent, restrict them to just 1p knowledge before the
experiment; in which case they are necessarily unaware of the
details of the protocol and will have a different perception of
what has happened.
In the case of restriction to 1p knowledge the situation becomes
much more analogous to what happens in QM where experiments might
have multiple outcomes. In that case there is no possibility of
communication between the different branches of the wave function,
so there is genuine uncertainty about outcomes, and probabilities
are estimated from limiting relative frequencies in the usual way.
If one derives and/or applies the Born Rule in QM, then one can
assign low probabilities to untypical sequences of results and the
like. If you mix 1p and 3p knowledge in the duplication scenario,
you lose this parallel with QM because the analogous 3p knowledge
is not available in QM.
If someone believes the MWI is true, then he is aware of the protocol
and trusts the operator. In duplication experiments there is no
logical reason why the copies could not be kept ignorant of each other
And there is no logical reason that prevents them from arranging
beforehand to communicate after the experiment -- in Helsinki, I could
decide to post my subsequent location to Facebook, and communicate with
other similar posts.
and there is no logical reason why copies in the MWI can't see what
each other is doing.
Such inter-branch communication in MWI is physically impossible. This is
the main reason why person duplication experiments can never emulate QM,
MWI or not.
Bruce
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