The linked publication https://www.scottaaronson.com/papers/giqtm3.pdf https://www.scottaaronson.com/papers/giqtm3.pdf speculates that the universe and our brai

The linked publication https://www.scottaaronson.com/papers/giqtm3.pdf https://www.scottaaronson.com/papers/giqtm3.pdf speculates that the universe and our brain are "quantum Turing machines". Given the assumptions, we need to count in the fundamental limits on computation. https://en.wikipedia.org/wiki/Limits_of_computation https://en.wikipedia.org/wiki/Limits_of_computation It's safe to deduce our brain can't simulate the universe, but only a "less powerful" description/representation of it. Otherwise the assumptions are inconsistent, and a paradox arises. Obviously, since we don't know how the brain nor the universe work... It's all speculation