Well as far as the acceleration of universe goes, i've always had simple suspision about that, it's very ATM, but would explain a lot of what is seen.

And in a way it might be tied in with brane theory.

Something odd happened to cause the Big Bang, or what ever you want to call it, which led to our universe as we know it.

We got a infinitely expanding universe.

But what would happen to an existing universe if another universe started up in another big bang.

Simple answer as the new universe grew it would push the older one out as they cannot occupy the same space at the same time. If you think of them as a 3-D sphere you eventually get a shell construct of universes.

Here is the fun part, even though they are shelled, someone in the older universe could not see the newer one, to them, they see accros thier own universe as if there was not a new one there.

But everything seems to be accelerating away from each other, except for localy bound groups of galaxies.

If the universe is especially old, and the outer most of the shell, the next new universe forming, will streatch it further out, to the point where space there becomes 2-D (a brane if you like) it's quite dead at that point, but as this continues, it will be pushed into another even older universe 2-D remenent, and portions of both will merge (and like brane collisions) start another chain reaction Big Bang.

Welcome to the wonderful and odd world of cyclic universes.

Again this my my suspision as to what is really going on, and what drives the bouts of universe accelerations. It is not mainstream by a long shot, and as far as I know, there would be no way to actually prove such a construct existed. But it is elegantly simple, and sometimes the simplest explanation is usually the right one, or close.

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hi i m new to this forum