It’s all fine and well to say “thermal noise” but if you allow for brains to be built from thermal noise with any sort of frequency, you end up with the bigger philosophical problem of Boltzmann brains.
I agree that Boltzmann brains are a philosophical problem, but they’re a problem precisely because our current best physical theories tell us that brains can fluctuate into existence. I don’t think the right way to deal with the problem is to say, “Boltzmann brains are problematic, so let’s just deny that they can exist.”
but they’re a problem precisely because our current best physical theories tell us that brains can fluctuate into existence.
Yes, but our current best physical theories also mean that they probably fluctuate into existence considerably less often than they form under normal circumstances (human brains, at least). A mind is a complex thing, so the amount of information it takes to replicate a mind is probably far higher than the amount of information it takes to specify an environment likely to give rise to a mind. If you discard the causal process that gives rise to minds in practice and postulate thermal noise as the cause instead, you end up postulating Boltzmann brains as well.
I didn’t mean that Boltzmann brains are a particularly big philosophical problem, just that they become one when you try to do philosophy where you postulate very specific things occurring by “random chance”.
I agree that Boltzmann brains are a philosophical problem, but they’re a problem precisely because our current best physical theories tell us that brains can fluctuate into existence. I don’t think the right way to deal with the problem is to say, “Boltzmann brains are problematic, so let’s just deny that they can exist.”
Yes, but our current best physical theories also mean that they probably fluctuate into existence considerably less often than they form under normal circumstances (human brains, at least). A mind is a complex thing, so the amount of information it takes to replicate a mind is probably far higher than the amount of information it takes to specify an environment likely to give rise to a mind. If you discard the causal process that gives rise to minds in practice and postulate thermal noise as the cause instead, you end up postulating Boltzmann brains as well.
I didn’t mean that Boltzmann brains are a particularly big philosophical problem, just that they become one when you try to do philosophy where you postulate very specific things occurring by “random chance”.