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Last time I checked, universe does not rotate at all, its total angular momentum is zero.
Is there a name for the type of momentum that leads to the expansion of the universe? Or is that just the total thermal energy that will become entropy at some point?
“Dark energy” or “cosmological constant” is what “pushes” the universe to expand. Not angular momentum, which is, according to our understanding is zero. By the way, it is the space itself that expands. There is no any “expansion force” that acts on stars.
We proved the no(-ish) angular momentum bcs of spacetime flatness, then we proved local unrealness.
And what about the angular momentum of the multiverse?
Why it would be any different in multiverse? The it is highly unlikely that the pure initial state had any angular momentum.
What is the universes themselves suspended in some sort of field are orbiting some pretty petunias?
In that (quite convincing) case, it still doesn’t revolve around you, unless you are that petunia.
You are right. I'm not The Petunia of the Macrocosm.
But that entity does hold the power to make universes "rotate". And if it so happens that I would be right within the axis of this howeverdimensonal plane, to the outside observer it would rotate around me. Still the angular momentum within the universe would not change & we wouldn't know about any of it.
Besides, if it makes the universes spin too fast they stretch out & burst spilling all the spacetime and gravity bits. And nobody likes to clean that mess up. The lil black holes stick & smear to absolutely anything. And the ascended type 5 minds are usually annoying af, flying nervously around constantly bumping into things. But that's why there is the cat.