Re: The multiverse is unscientific nonsense??

`On Wed, Nov 29, 2023, 8:34 PM Brent Meeker <meekerbr...@gmail.com> wrote:`
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>
>
> On 11/29/2023 4:17 PM, Bruce Kellett wrote:
>
> On Wed, Nov 29, 2023 at 10:49 PM Stathis Papaioannou <stath...@gmail.com>
> wrote:
>
>> On Wed, 29 Nov 2023 at 12:34, Bruce Kellett <bhkellet...@gmail.com>
>> wrote:
>>
>>> On Wed, Nov 29, 2023 at 12:02 PM Stathis Papaioannou <stath...@gmail.com>
>>> wrote:
>>>
>>>>
>>>>>> The Born rule allows you to calculate the probability of what outcome
>>>> you will see in a Universe where all outcomes occur.
>>>>
>>>
>>> You are still conflating incompatible theories. The Born rule is a rule
>>> for calculating probabilities from the wave function -- it says nothing
>>> about worlds or existence. MWI is a theory about the existence of many
>>> worlds. These theories are incompatible, and should not be conflated.
>>>
>>
>> “The Born rule is a rule for calculating probabilities from the wave
>> function -- it says nothing about worlds or existence”  -and- “MWI is a
>> theory about the existence of many worlds” are not incompatible statements.
>>
>
> Perhaps that is the wrong way to look at it. The linearity of the
> Schrodinger equation implies that the individuals on all branches are the
> same: there is nothing to distinguish one of them as "you" and the others
> as mere shadows or zombies. In other words, they are all "you". So you are
> the person on the branch with all spins up and your probability of seeing
> this result is one, since this branch certainly exists, and, by linearity,
> "you" are the individual on that branch. This is inconsistent with the
> claim that the Born rule gives the probability that "you" will see some
> particular result. As we have seen, the probability that "you" will see all
> ups in one, whereas the Born probability for this result is 1/2^N. These
> probability estimates are incompatible.
>
>
> How is this different than throwing a die and seeing it came up 6.  Is
> that incompatible with that result having probability 1/6?  Why don't we
> have a multiple-worlds theory of classical probabilities?
>

It's interesting, Feynman and others had this exact debate in that
reference scerir provided (asking how quantum probabilities are different
from dice rolls, Feynman thought there was an important difference).

Jason

> Brent
>
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