On 9/4/2020 4:43 AM, Bruce Kellett wrote:
On Fri, Sep 4, 2020 at 9:32 PM smitra <smi...@zonnet.nl
<mailto:smi...@zonnet.nl>> wrote:
Even if the MWI is false and the wavefunction collapses to produce
only
one of the possible outcomes with a probability given by the Born
rule,
you'll still get all possibilities realized in a generic infinite
universe, whether it's spatially infinite or a universe that
exists for
an infinite long time.
The only way to find out what exists beyond the realm we've
explored s
to do experiments. No philosophical reasoning about the
interpretation
of probabilities can ever settle whether or not the universe is so
large
or will exists for such a long time that another copy of me exists.
That's why these discussions are not so useful as an argument of
whether
the MWI is correct or not.
I think something along those lines was Sean Carroll's answer to the
points David Albert raised. Unfortunately, it doesn't wash!
Applying the Born rule to the repeated measurement scenario tells you
that the probability of the extreme branches is low; whereas, the idea
that all possible outcomes occur on every trial trivially implies that
the probability of the extreme cases is exactly one. The contradiction
couldn't be more stark, and waffling about infinite universes
isn't going to change that -- the theory gives two, mutually
contradictory, results.
But the probability of /observing/ extreme cases isn't 1 for a given
observer.
Brent
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