Recently I watched a minute-physics video that suggested that a better name for the beginning of time would be "Everywhere stretch" because there wasn't a space-time singularity that formed where the universe began to expand but the expansion happened everywhere.
Well, if the expansion did happen everywhere that means that space and stuff had already existed. So what would happen before that expansion and why cant we see it (why don't we receive any signals?
In the end, as you can see, he brings up a theory that cannot be excluded, which suggests that the beginning of our universe was the end of another because of the Big Crunch, the collapse of space on itself. If that's true how the does the expansion of the universe decelerates and reverses its direction (becoming contraction)? I mean, the gravitational force becomes weaker while the galaxies move away while dark energy continues to "push".
The only think that comes to mind is that sometime in the future the impact of dark energy will become negligible and the gravitational force will overcome it, thus making the universe contracting. But that would lead to an oscillation of the universe.(pretty stupid ha?)
So every now and then I hear about different interpretations of the Big Bang theory. Sometime ago I asked in the forum if the Big Bang really happened, thinking that I knew what I was talking about,but now I realize I am actually confused. So what is really the Big Bang theory to a physicist, because I can understand that media distort the picture that we have (if we have) about it?
So, sorry for having a lot of questions and expressing them so confusingly; my only knowledge on the matter comes from Steven Hawking books and some articles. I have numbered the questions so that I avoid causing any more confusion.