On 09-08-2019 11:59, Jason Resch wrote:
On Friday, August 9, 2019, smitra <[email protected]> wrote:
I remember the year 1980, but what I remember is due to brain
processes that exist right now. I can only ever probe the present
moment, there is no way to prove that 1980 physically exists or
existed (whatever the past tense is supposed to mean). So, if 1980
exists (existed) it must be considered to be a parallel world where
the people in our memory of that time really exist (existed). The
time evolution operator from that time to the present can be
expanded in a basis where complete sets of commuting local
observables are diagonal. One of the simultaneous eigenstates is the
present world we find ourselves in. So, if we assume that 1980 is
indeed real and the present world which is one particular component
of that same 1980 state written in a different basis, then it's
plausible that all the other MWI parallel worlds of 2019 are equally
real.
This sounds similar to Wei Dai's "really simple interpretation of
quantum mechanics": http://www.weidai.com/qm-interpretation.txt [1]
Yes, and if one represents an observer as an algorithm, then that would
require computing probabilities by summing over all the states where
some particular algorithm corresponding to some particular observation
is instantiated. Algorithms can be represented as entangled states
without having to invoke time evolution. You just have to write down
the effect of different inputs leading to different outputs as an
entanglement existing at moment in time.
So, quantum mechanics makes it possible to define observer moments. A
given observation will come with a resolution, what is below the
resolution we can perceive still exists physically, counterfactuals at
that level will exist in the relative state of the observer that makes
that observation in the form of entanglement. This entanglement then
makes the algorithm rendering the observation well defined.
Regarding the reality of other points in time, while we can't disprove
the theory that the universe was created 5 seconds ago in it's current
state, it is an implication of special relativity that all points in
time are real as this paper describes:
http://philsci-archive.pitt.edu/2408/1/Petkov-BlockUniverse.pdf [2]
Thanks, I'll read that paper!
Saibal
Jason
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[3].
Links:
------
[1] http://www.weidai.com/qm-interpretation.txt
[2] http://philsci-archive.pitt.edu/2408/1/Petkov-BlockUniverse.pdf
[3]
https://groups.google.com/d/msgid/everything-list/CA%2BBCJUi5xX5L3LDtiOyLq8hcuA3df4dzEvLwQt%2BAXUp2c4yW0w%40mail.gmail.com?utm_medium=email&utm_source=footer
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