Main Question or Discussion Point
What were the necessary conditions to allow a big bang to occur?
That is model-dependent. There are several models of conditions around the start of expansion. We don't yet have the means to test them: to rule some out and prefer others.What were the necessary conditions to allow a big bang to occur?
No, young kiwi. At this point they can only crank the model back a little farther and peer a little farther back in time (assuming the model is right and can be checked out using present observations.) For now, using a straightforward, conceptually economical, model that is already pretty good. But they sure are not answering any big questions like "where did it, why did it etc"Was the model you mentioned talking about in what condition the expanding stops and Big Crunch starts?
Certainly, Youngkiwi, there is that. A key issue is dark energy, though. It isn't clear that DE is constant or that it is bound to be the same in a prior collapsing phase of the universe as it is here. In the extreme conditions of a bounce some stuff might be altered.Thanks, Marcus.
Is there any model talking about in what condition the expanding stops and Big Crunch starts?