On 15 Apr 2016, at 19:23, John Clark wrote:
On Fri, Apr 15, 2016 at 10:27 AM, Bruno Marchal <[email protected]>
wrote:
>>> nowhere is there any action at a distance, nor any
indeterminacy or event without "cause".
>> That would only be true from the viewpoint of somebody
standing outside of the multiverse looking back in at it, and that
is a viewpoint that can not exist because there is no place
outside of the multiverse and thus no place to stand. So you're
talking about what it would be like if impossible things could
happen, and that can be entertaining (I like the Harry
Potter books) but it's not science.
> You don't need to stand outside the universe when you do
theoretical physics.
It's not just that you don't have to, you CAN'T do theoretical
physics from a viewpoint that CAN NOT EXIST because the result
would be ridiculous and useless.
It does not exist physically, but it can still exist mathematically,
logically, etc.
Or to put it another way, if you start with a unphysical premise
then you will reach a unphysical conclusion and that does neither
mathematicians nor physicists any good.
That would make disappear a lot of thought experience which have play
an important role in the advance in physics (in Galilee, Einstein,
Maxwell, etc.).
Anyway, I don't take any metaphysical assumption for granted.
> You can define the universe by some solution of some equation
Yes, and I can define 7 as 2+2+2 provided that 2+2=5; garbage in
garbage out, if you start with a unphysical premise (like a
viewpoint that can not exist) then you will reach a unphysical
conclusion (like things can be deterministic local and realistic)
regardless of how scrupulously you've manipulated the mathematical
symbols. And you seem to have a unhealthy reverence for definition
and a belief that if human beings can define something then that
magically confers a physical reality to it.
Not at all, I explain why the physical observable are determine by the
logic of the Turing machine observable, and this is not related to
definition, but to some special variant of the logic of self-reference
restricted to computable sentences (sigma_1 sentences). precisely the
unique measure is given by the ortholatice provided by the G* logic of
the variant []p & p, []p & <>t, and []p & <>t & p, with p sigma_1.
That is motivated by the global First Person Indeterminacy, and the
math of the Universal Dovetailer. The physical is a very special
arithmetical phenomenology. There is no magic, and is deduced from a
principle of invariance of consciousness for digital emulation at some
level.
Bruno
I can define Harry Potter as a bespectacled boy wizard but I have
never physically met him nor do I expect to.
John K Clark
(like in Einstein's GR, or Dewitt-Wheeler equation, etc.).
Bruno
John K Clark
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