Check - the BB is 23.25 billion light-years away spatially

[Gibsense]

1. Time Zero - Big Bang to Date - is approx 13.8 billion years.
2. Time Zero measured spatially from now to then is 23.25 billion light-years (If we are a hypersphere)
3. The Hubble Constant relationship is the universe's expansion derived from the age (13.8) and the circumference increase. An AI confirmed that it was consistent with the facts.
4. The derived 93 Billion light-year diameter of our observed universe is the circumference although I would make it 86.4 Billion Light years based on the 13.8 billion year age (close enough)
5. The Hypersphere of a Black Hole becomes (wormhole effect time-reversed) the Hypersphere of a wormhole White Hole
6. The boundary of our observed universe is the Event Horizon of the White Hole (our universe)
7. If we were at the Pole, say, by travelling through space we would be approaching the boundary of the observable universe as it receded from us (we would be travelling around the Hypersphere circumference) I.e. a bounded but infinite spatial universe.
8. Our Universe bubble is embedded in a "Greater Mother universe" (Billslugg help)
9. The expectation would be that our "parent" Black Hole had a spin that probably would be transferred to us. The spin would produce a bulge at the equator of our universe. We should look for it.
10. We should expect far-off galaxies to exhibit more maturity than expected and we should use longer wavelength light (more than James Webb) and expect to see further (more galaxies)
11. The AI available are unbiased and can verify - or not - our ideas. Hence the confidence to state this so boldly, lol. Of course just my thoughts alone!

 

[billslugg]

Sorry, never heard of a "Greater Mother Universe". The universe is everything there is. Can't be anything outside of that. There is no "outside" to the universe, it expands within itself, a 3 dimensional analogue to the two dimensional expansion of the surface of a balloon being blown up.

 

[Gibsense]

Sorry, never heard of a "Greater Mother Universe". The universe is everything there is. Can't be anything outside of that. There is no "outside" to the universe, it expands within itself, a 3 dimensional analogue to the two dimensional expansion of the surface of a balloon being blown up.

Sure, that's what a hypersphere is: Analogy: blow up the balloon surface is 3d space etc.
I referred to your post some time ago requiring discipline regarding the word "universe". I could not remember what was said.
But back to the theme. The universe (balloon universe(?) I described as possibly ours) is, of course, 'self-contained'. The 3d surface (of the balloon analogy) has a boundary (event horizon) but the space 'goes on forever' and increases as the 'balloon ' grows.

However, the balloon (bubble universe) can be said to be embedded in a possible (no evidence, unknown but possible) space. The embedding space can have the same dimensions as the balloon hypersphere but be Flat. That is a flat 4 dimensions.
If the embedding space exists in reality (which I think is highly likely), it may host another adjacent hypersphere, a balloon. I notice a proposal for 2 Big Bangs to produce a sister universe adjacent to ours; responsible for dark matter effects, is supposedly the latest scientists' suggestion.
The word 'Universe' is confusingly overused!

 

[Rangerer]

Two thoughts from a non-physicist:
Size of the Universe - there cannot be an ultimate container for the Universe, so there cannot be a measurement of the radius, therefore it is infinite and has no "container-like" qualities.
Black holes - I think I am correct in assuming that black holes are formed by local gravitational forces; so their birth, growth, and existence are purely local phenomena; therefore, since they did not come from anywhere else, they cannot go anywhere else; therefore it's not reasonable to assume they go anywhere, or connect to anything, certainly not the unicorn of cosmology, a "white hole."
One further thought; since the universe is infinite, its existence is also infinite, therefore the BB was simply a local phenomenon, not rare, and not a "beginning" for the true Universe.
That's how I think it goes.

 

[billslugg]

What physicists say:
Size of the Universe: They split the baby. Universe is bounded but infinite. If you go far enough in one direction, you end up where you started.
Black Holes - They are part of our universe since we can see them.
BB - was not local, occurred everywhere at the same time.

 

[Gibsense]

therefore, since they did not come from anywhere else, they cannot go anywhere else; therefore it's not reasonable to assume they go anywhere, or connect to anything, certainly not the unicorn of cosmology, a "white hole."

Yes, this sort of view is rather 'old fashioned'. When I was a lad it was said that the universe was a 'just is' and it did not exist in something - even in nothing. Similarly, the process of time commenced at the BB. This may well be correct but...
Along came String theory with suggestions of plates banging into each other and creating universes. Gradually an 'open-mindedness' toward 'what the universe exists in' has developed. No amount of word games suggesting the universe is all there is alters this, hence the confusing mixture of multiverse and other expressions.
The fact that a cat can be in a box and the box is in a room and the room is in a house destroys your logic