On 13 May 2012, at 23:19, Evgenii Rudnyi wrote:
On 13.05.2012 15:09 Bruno Marchal said the following:
On 12 May 2012, at 14:59, Evgenii Rudnyi wrote:
On 12.05.2012 13:33 Bruno Marchal said the following:
All this is well known. Copenhagen theory, or "unique-universe"
are non computationalist dualist theories.
But as Shimony has shown, the idea that consciousness collapse
leads to many difficulties, like non local hidden variables in
or solipsism in philosophy of mind. Or even just the problem to
exactly is the collapse, on which all believers in collapse differ.
Computationalism and Everett (QM without collapse) have no
that respect, and line up well with the everything-like use of
I listen currently to Beginning of Infinity by David Deutsch. Yet, I
am not convinced that Multiverse is a good explanation.
The multiverse is a logical consequence of "1+1= 2", and mechanism.
don't need quantum mechanics.
Then quantum mechanics, the first theory in physics succeeding to
survive more that 5 years (indeed about a century now), is very
and based on very simple math, and it confirms the mechanism
So, to avoid the multiverse, you have to postulate very special
laws, yet unobserved, and a very special theory of person, yet
unobserved. Why not, but it is very speculative, and seems to be
by wishful thinking only.
I am glad that you believe in multiverse and find it logical.
I am just saying that a "multiverse" or a "multidream" is a logical
consequence of comp. Not that I believe in multiverse.
But yes, it is plausible, and simpler conceptually than the
speculation about one universe, or one computation.
Yet, I guess that even not all physicists believe in multiverse.
When you convince all physicists that multivers exists, I will start
thinking about it.
On reality, usually all humans are wrong. Also, if people start
reasoning when the majority is convinced, this means that no one
reason really. You should avoid that kind of authoritative argument.
Science is not a question of majority vote.
For example, I do not remember that multiverse has been even
mentioned in The Elegant Universe by Brian Greene. He discusses an
eleven-dimensional space needed for the superstring theory but not
Martin Gardner said that the "many worlds" concept was the best hidden
secret of the 20th centunary (and he talked of the QM multiverse, not
the "more obvious" comp one).
You could as well defend the theory that the earth is flat, and
hoc rules to explain why it seems to be a sphere.
I personally consider quantum mechanics just as a model.
Yes. It is a theory. An hypothesis, very weird, but strongly
by the facts, and whose main weird consequences are also a
of elementary arithmetic, and mechanism (even without any facts).
David Deutsch does not like it, he says that instrumentalism is a
philosophy and that we must take physical theories literally.
I agree with Deutsch on this. That is science. Taking ideas
so that we can change the theories more quickly when refuted. But
Deutsch uses comp, and very typically, like many, ignore its logical
consequence. So Deutsch does not follow his own philosophy.
In general, I am disappointed by his book. His style, "I know the
truth as this is a good explanation" is far away from skeptical
After all, we know that quantum mechanics and general relativity
contradict to each other. Why then to invest too much time into
interpretations like Multiverse? Why it is useful?
To learn and to try to figure out what happens here and now.
Let us take chemists. They use molecular modeling for a long time
and I would say they have been already successful without a
No, this is false. They use multiverse all the time. They prefer to
talk with the "superposition state labeling", and they can invent for
themselves the idea that QM does not apply to them, to avoid the
contagion of he superposition state, but that's word play to avoid
looking at what happens. It is just avoiding facts to sustain personal
conviction. Humans does that all the time. QM = multiverse. The
collapse of the wave is already an invention to hide the multiverse,
and it has never work.
Do you mean that when all chemists accept the multiverse
interpretation, they will start working more productively?
They accept it. I have a book, by Baggot, who explains that he taught
chemistry for 17 years, absolutely convinced that QM was true only on
little distance, so he predicts that nature did not violate Bell's
inequality, but when the experience of Aspect was done, he revised his
opinion, and accept the idea that QM might be true macroscopically,
and that it makes the weirdness a real fact of life. De Broglie
behaves like ghat too. This illustrates that people can use a theory,
without taking it seriously, because they follow their wishful
conviction. It is typical for humans to do that.
If you decide the destination of your holiday with a quantum choice,
QM predicts that all the term of the wave makes sense, and that "you"
will differentiate into going to all the chosen Holiday places. If you
believe that only one term "really results", it is up to you to say
what is wrong in QM.
Now, physicists never define what they mean by universe, with comp, we
could say that there is zero universes, indeed, zero physical objects,
we are dreaming those things, the universes are first person plural
construct. The "matrix" image is more close to reality than a
substantial reality, and this, by comp, explains where the physical
reality comes from. To have a unique real universe, you need a non
computationalist theory of mind, and nobody even try to present one.
The weakening of the comp hypothesis does not suppress any "universes/
dreams", on the contrary.
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