Re: Interested in thoughts on this excerpt from Martin Rees

From: Bruno Marchal <>
Date: Mon, 7 Aug 2006 15:24:32 +0200

Le 07-août-06, à 01:44, W. C. a écrit :

>> From: Bruno Marchal
>> ...
>> But it is easy to explain that this is already a "simple" consequence
>> of
>> comp. Any piece of "matter" is the result of a sum on an infinity of
>> interfering computations: there is no reason to expect this to be
>> "clonable" without cloning the whole UD, but this would not change any
>> internal measures (by Church thesis and machine independence).
>> ...
> I remember you said "comp can be tested experimentally due to others
> consequences (like the observable interference among many computations,
> etc.)".
> Can you provide more details on how to do the experiment to see
> "matter" is
> the result of a sum on an infinity of interfering computations???

Comp says that there is a level of description of yourself such that
you survive through an emulation done at that level. But the UD will
simulate not only that level but all level belows. So comp makes the
following prediction: if you look at yourself or at you neighborhood
sufficiently close enough, you can in principle detect, indirectly, (by
computing the relative comp histories) the presence of all the sublevel
So it is enough to observe closely your neighborhood. But of course
experimental physicists does exactly that, and the fact that they infer
Many-Worlds (many Histories/many computations) from their observations
can be seen retrospectively as a confirmation of comp.
(This explains that up to now, only people with a good grasp of the
conceptual difficulties of the quantum theory can swallow the
consequences of comp, more or less).
To be sure "negative interferences" remains quite astonishing (after
such an informal reasoning), but then if you take into account the
results in computer science and mathematical logic, there are evidence
that "negative interference" appears as related to some variant of the
incompleteness phenomena. This is somehow counter-intuitive and hard to
justify in "french". More in a summary which should come asap. I hope
this already helps.


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Received on Mon Aug 07 2006 - 09:26:35 PDT

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