[ExI] Boltzmann brains

[Rafal Smigrodzki]

On Sun, May 3, 2020 at 11:31 AM John Clark via extropy-chat <
extropy-chat at lists.extropy.org> wrote:

>
> We have infinity to work with if Hugh Everett's Many Worlds interpretation
> of Quantum Mechanics is correct, or if Eternal Inflation is right, and if
> the inflationary model of the Big Bang is right then Eternal Inflation
> probably is too. And even if none of that is true and the universe is
> finite in the past dimension it could still have a infinite eternal future.
>

### For the Boltzmann brain idea to be a paradox you need to consider not
so much the size of the universe (or multiverse), as the density of
biological vs Boltzmann brains per unit of volume. Using a simplistic
approach, biological brains that are a part of larger entities (such as
galaxies) should be much less common per unit of volume, than Boltzmann
brains, since the former require many more atoms to come together.

As I mentioned elsewhere, the resolution of the paradox is that galaxies
and biological brains (but not Boltzmann brains) are created by physical
law, not randomly, so their density is dictated by physical law and cannot
be easily simplistically deduced from the number of moving parts inside
them.

Rafal
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