A lot of threads on this forum and others are discussing pre bang models, Edit based around inflationary theory, here is a simple easy to follow link on what is happening in inflationary theory, as a primer to what the link below is about http://aether.lbl.go...-beginners.html
The following is a discussion by Roger Penrose, Sean Carroll, Laura Mersini-Hougton 1 second after the big bang from a hot dense universe is not debated and assumed fact by all. Prior to this the pros disagree, but it is also interesting to see how much they agree.
Roger has an interesting theory on how the inflationary phase of the BB may have appeared to have happened.
Edit I think this theory is what Penrose was referring too > Conformal cyclic theory https://en.wikipedia...ic_cosmology.
Edited by Flummoxed, 21 February 2019 - 04:03 PM.