"....there wasn't a single big bang, but an infinite number of small bangs..."

This is essentially what I see occurring presently. Creation is ongoing.

We aren't really equipped to envision this level of reality. For example, you refer to the space outside our universe, but there is no space outside the universe. Spacetime, also, is a thing, not space and time. So not only is space continuously spontaneously erupting out of the vacuum pressure, time also.

Interestingly, gravity is also some feature of this spacetime. It's not a force, but an aspect of the relationship between forces (mass, which forces exert) and spacetime, a distortion in spacetime itself produced by forces in it. It does not take millions of years for the effect of gravity to travel between stars millions of lightyears apart because gravity is just how those masses impact the spacetime they exist in, and the spacetime doesn't take millions of years to distort. The gravitational force exists just as the spacetime exists, because it is a feature of spacetime.

The interesting thing about this, to me, is that this means that everything in the universe is linked in realtime. Such information as gravitional influence reaches to the furthest extent of spacetime without having to get there. It's all there as soon as spacetime is distorted, which is as soon as mass exists, wherever mass may be.

So gravity, space, and time are all aspects of some thing, and that thing is continually erupting into existence. All information concerning that thing and all the forces interacting with, and in, it is impacting the whole universe simultaneously. We don't know how to access that information, but it's there anyway, Heisenberg be damned.

As you might guess, I am not in agreement with the Copenhagen School of quantum theory. Probability may be the best guess we can come up with, but the universe is deterministic, necessarily. God doesn't play dice, Einstein said, and I don't think more than one roll of the dice is possible in terms of physics. Since the dice, the table, and all factors affecting how the dice will be rolled are in intimate relation, that roll may appear random to us, who don't know all those factors, but it is as predetermined as our first loves ending in tragedy.

Or was that just me?

Not a physicist, nor a mathematician, but this is my grasp of relativity and Hawking's proof of spontaneous particle production.

Interesting questions you ask.

Thanks!