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.
surely if the universe has an infinite lifespan there could be an infinite number of humans? for whatever passes as a human at any given time. the two concepts may even overlap.
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.
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.
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.
surely if the universe has an infinite lifespan there could be an infinite number of humans? for whatever passes as a human at any given time. the two concepts may even overlap.
not that it matters for the day-to-day, anyway.
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.
it is very interesting, but it’s also one of those topics that makes anything else in the conversation not matter.
also do note that i said nothing about thinking sensory inputs are illusory, just that belief is not required for things to exist.