We don’t know for sure what universe we live in, since we don’t have enough information about it. The distribution they construct is over infinitely many possible universes, of which ours is one, just not clear which one. They calculate the odds that our universe has only us and no ETIs, based on this distribution.
We don’t know for sure what universe we live in, since we don’t have enough information about it. The distribution they construct is over infinitely many possible universes, of which ours is one, just not clear which one. They calculate the odds that our universe has only us and no ETIs, based on this distribution.