On 9/13/2019 10:12 AM, smitra wrote:
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.
So if I forget about that accident in 1987 my collar bone won't have
been broken and it will be straight again?
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.
If that happened how would you know? You'd be finding yourself where
you were...which is just a tautology.
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.
Which is to say you'd not win.
Brent
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