[blueflow]

I don't think it is infinite - each universe can only have that mass/energy that fell into the outer black hole in the parent universe. At some level you'll inevitably have black holes with universes that do not have enough mass to form another inner black hole.

[soulofmischief]

Unless, although there's no reason to currently believe this, the energy requirements for physics are relative within each black hole, sort of (but not strictly) like how the speed of light is relative for all observers. And we can get a little crazier, and imagine a meta universe that is sort of like a Klein bottle in that it doesn't just recurse all the way down but somehow folds back into itself. Again, no current reason to believe anything like this but it's a mind-boggling to visualize.

[idiotsecant]

How much mass is required to form a black hole in a new universe with perhaps different physical constants? It could be that 'ability to make black holes' is a prerequisite for successful universes in the way way that good genes are a prerequisite for successful organisms. The universes that fail to spawn black holes are 'dead ends' so any life is statistically likely to find itself in a black hole spawning universe.

Maybe there is an 'incentive' for universes to form with physical constants tuned to produce black holes with the available energy in that universe.

[IngoBlechschmid]

This circle of ideals seems to be known as: https://en.wikipedia.org/wiki/Cosmological_natural_selection