On 11-09-2019 19:41, Stathis Papaioannou wrote:
On Thu, 12 Sep 2019 at 00:51, smitra <[email protected]> wrote:
Back to basics. There exists a universal wavefunction that evolves
according to the Schrodinger equation. Observers are internal
structures
in this description. Whether or not one believes that the Born rule
can
be derived or not, what matters in practice is that you'll end up
having
to use it, so you have to assign a measure for observations that is
given by the summation of the squared modulus of the states that
correspond to those observations. The information about personal
identity must then also be extracted from the wavefunction, so one
cannot insert this in an ad hoc way.
Quantum immortality is therefore wrong because the measure of the
states
that correspond to extremely old observers is small.
This means that if you don’t know if you are young or very old and
have to guess, you are more likely to be right if you guess that you
are young. But it does not mean that you won’t inevitably become
very old.--
Indeed, there is always going to be a very small probability of finding
yourself in a very atypical situation. In the MWI we would need to take
into account all possible relevant processes here, and forgetting about
some fact and learning about that again will tend to replace extremely
atypical information from he memory and replace that by more typical
information.
In the MWI the so-called stability of records of measurements is not
valid in an absolute sense. It's only valid in each branch, but you can
hop from one to another branch such that all your memories are swapped
with those of your copy. So, if I find myself to be a trillion years old
and I go top sleep then I'll most likely wake up as a copy that has that
information about me being a trillion years old replaced by a more
reasonable lower number.
This also means that even if you win the lottery and become a multi
millionaire, you'll very likely end up forgetting this and finding
yourself to not having won the lottery.
Saibal
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