I forget the name, but there was a sci-fi story where a human inter-generational ship was powered by special engine which spun off tiny black holes. Midway through their journey they started detecting signs of alien civilizations using the same engine.
The characters theorized that when each little black hole was getting pinched off into its own isolated new universe, it carried a variation of the physical laws of the one it came from... And that maybe all the cosmically-sudden intelligent life was because spacefaring intelligence was how our type of universe reproduced.
The characters theorized that when each little black hole was getting pinched off into its own isolated new universe, it carried a variation of the physical laws of the one it came from... And that maybe all the cosmically-sudden intelligent life was because spacefaring intelligence was how our type of universe reproduced.