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It’s an assumption, not an extrapolation. Assumptions, without evidence are beliefs.

We assume several unprovable axioms to allow science to function. A lot of work has also been done to collapse them down to the core minimum. What is left is still built on belief.

The fact that the results are useful back validates those beliefs. It doesn’t prove them however.

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lime@feddit.nu ⁨9⁩ ⁨hours⁩ ago
we’re comparing it to a system where none of that has been done. it’s sort of a “god of the gaps” situation but the gaps are shaped exactly like pieces in a puzzle. we can extrapolate the form of the proof even if we can’t show it. the same is not true of the other camp.

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- cynar@lemmy.world ⁨9⁩ ⁨hours⁩ ago
  You say that, but, if the universe has an infinite lifespan (as current models suggest) then we would almost certainly be Boltzmann brains. (There would be an infinite amount of Boltzmann brains, but only a finite number of humans)
  
  I personally believe I am not, and the universe actually exists, rather than a sensory/memory ghost.
  
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  - lime@feddit.nu ⁨6⁩ ⁨hours⁩ ago
    surely if the universe has an infinite lifespan there could be an infinite number of humans? for whatever passes as a huban at any given time. the two concepts may even overlap.
    
    not that it matters for the day-to-day, anyway.
    
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    cynar@lemmy.world ⁨5⁩ ⁨hours⁩ ago
    The logic is that the universe of big bang matter has a limited lifespan. This sets a hard limit on the number of humans via “normal” means.
    
    Boltzmann brains are due to a quirk of quantum mechanics. Matter can come into existence spontaneously. The rate is proportional to the amount (technically the energy content). Given enough time and space, something that would fit the definition of human could spontaneously appear. The odds of this are unbelievably long, but, so long as it’s finitely large, in a true infinite universe it will happen an infinite number of times. It’s a bit of infinity Vs very large number weirdness.
    
    End result is that there will be a large but finite number of “normal” humans, but an infinite number of Boltzmann brain humans. Therefore, the chances of being an actual “normal” human is effectively infinitesimal.
    
    Agreed about it not mattering, day to day. It’s one of those things that is of interest to theoretical physicists, since it might tell us something interesting about the nature of our universe.
    
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  - Digit@lemmy.wtf ⁨5⁩ ⁨hours⁩ ago
    
    if the universe has an infinite lifespan (as current models suggest) then we would almost certainly be Boltzmann brains
    
    Sounds like presuming some place further along in an infinite set. We may still be in an early iteration at the start, as plain as it seems.
    
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