On 16 Mar 2015, at 15:33, Bruno Marchal wrote:
On 12 Mar 2015, at 02:07, meekerdb wrote:
An excellent talk by Sean Carroll explicating where the gaps are in
Everett's MWI as applied to cosmology and providing a solution to
the Boltzmann brain problem:
https://www.youtube.com/watch?v=5TFy6Ben0Ho
Note that toward the end he seems to require a conscious observer
to bottom out the epistemology, i.e. to have a measurement actually
made. Be sure to listen to the Q&A too.
Coincidentally, I came across Lubos Motul's discussion of MWI in
which he has an extended argument with Ron Maimon. I don't like
Lubos's politics or his style or argument which is arrogant and
bombastic. In this case he is being very critical of Sean Carroll
whom is a very nice guy and I do like - but I think Lubos makes
some fair points.
Interesting. Note that qZ1* is very plausibly more on the side of
infinite Hilbert Spaces, at least formally, and this would mean the
universal machine would choose the second option, leading to
Boltzmann brain problems in the comp solution of the mind-body
problem.
Nevertheless, we have to derive the very equation of physics from
the "Boltzmann brain" that exists in arithmetic, which is assumed by
Carroll (except it use the aristotelian picture to very quickly put
the problem under the rug, almost namely).
It is nice that physicists see the inflation of experiences/brains
problem in physics. It can help them to become aware of the mind-
body problem, and better appreciate that such problem is already
there in arithmetic, even without Universe.
In fact it is interesting that Sean Carroll comes up with the same
alternative of the UDA 1-7 reasoning: where the choice is between a
physicalist ultrafinitism (a finite universe) and a an infinite
universe, with a Boltzman brain problem.
But then the step 8 makes or should make the computationalist
abandoning the ultrafinitist and materialist assumption: it does not
solve the problem. We have no choice other than solving the
arithmetical "Boltzman Brain Problem" in arithmetic.
To be sure, I have to meditate more on some of Sean Carroll saying
about how to interpret stationary states in quantum mechanics, too.
Bruno
Bruno
Brent
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