Singularity and Momentum

[ParanoiA]

I'm having a hard time understanding the multiverse theory. I thought I read some time ago, that the universe as we know it is like two plates moving away from each other, or expanding, set in motion by the big bang...and that they eventually come back together, singularity, and then big bang again..and so on.

 

Now when I look up information on it, I see no mention of that part. Just dimensions.

 

I'm wondering if this "expansion" and eventual "collapse" happen at different momentums, creating differences in physics and time. I would think the speed at which the plates move apart and come back together would have an impact on the vacuum within it. Is that true?

 

Does any of that even make sense? Or did I just dream all this...?