b) that it is unlikely that any given random universe supports intelligent life (2),
then a universe that does support intelligent life would most likely just barely do so. That is a kind of prediction.
And sure enough, our universe does seem to barely support intelligent life. We only appeared after 15 billion years or so. Vast portions of the universe are devoid of life. It appears that after a while all life will die out and the universe will be sterile forever. Humans were down to a few thousand breeding pairs and could have easily gone extinct.
(1) There are different kinds of many worlds. Quantum many-worlds, but also it is possible there are many worlds from multiple inflationary processes, each with their own physics constants, and some people think that every mathematically possible universe exists in some sense.
(2) Most toy universes seem to be degenerate in some way e.g. everything collapses into a black hole, no atoms form, etc.
To add to this, if we assume
a) many universes (1),
b) that it is unlikely that any given random universe supports intelligent life (2),
then a universe that does support intelligent life would most likely just barely do so. That is a kind of prediction.
And sure enough, our universe does seem to barely support intelligent life. We only appeared after 15 billion years or so. Vast portions of the universe are devoid of life. It appears that after a while all life will die out and the universe will be sterile forever. Humans were down to a few thousand breeding pairs and could have easily gone extinct.
(1) There are different kinds of many worlds. Quantum many-worlds, but also it is possible there are many worlds from multiple inflationary processes, each with their own physics constants, and some people think that every mathematically possible universe exists in some sense.
(2) Most toy universes seem to be degenerate in some way e.g. everything collapses into a black hole, no atoms form, etc.