As I re-read, I think Exchemist has taken care of much of this. I'll see what I can add. First, the source: a bookazine from Scientific American called Wonders of the Cosmos. First section: How Did The Universe Begin?. First chapter: The Black Hole at the Beginning of Time. If you want to find it, this is the Fall 2017 Special Collector's Edition.
I could wish you had a copy because of what I must describe. It is an illustration that requires your imagination otherwise. You are familiar with the cone-shaped diagram that is often used to illustrate the early history of our universe. We have a similar cone back up to it, small ends together. This cone represents the imagined 4-D universe from which our universe came at the implosion of the two. (speculation, of course). It does actually show "Time at the 4-D cone with arrow pointing forward to the implosion point. And I suppose, if you are going to imagine this 4-D universe, you have to give it Time, do you not? And space?
The point where the two meet is called the Event Horizon. Next section is described thus: Most commonly known model: big bang (white dot) followed by inflation (black curve). Next is a small ring called Cosmic Microwave Background Horizon. Then, of course, The Dark ages, All this you know. I just wanted to get across how they link the 4-D universe to our 3-D universe. If you already also knew that, apologies.
The authors explain why they have done this investigation into the 4-D universe because of problems contemplating the 3-D universe. The successes that scientists have had coming forward from the Big Bang "belie deep and complex mysteries that may lend themselves to a holographic explanation". Problems:
1) Not understanding the five parameters
2) Not understanding inflation completely
3) Not understanding how it all began.
I rather thought that third one was good enough to imagine this idea which, of course is not a new idea, just an enriched one, I think. There is much, much more well-worth reading but i must not rewrite the book.
This black hole that they are "creating" is, by the way, three-dimensional, not two as are the rest of the black holes that we think we know exist. I still must find the story of the one star exploding. I never found it last night. It may be in the next chapter: "The First Starlight". I know we need that clarified. I'll look for it and be back -- if our threatening skies don't turn loose with the red rain of Pern.