There is even more to the picture than that. Some recent articles talk about an
"ekpyrotic universe" (click for an article) where the "big bang" event is one of many recurring collisions between branes. This allows the event to cover substantial portions of space in the collision(s) such that "inflation" is not required. It also predicts the effects observed that require the additional concepts of both dark energy and dark matter to the standard model.
The repeating cycles of universes should make fundamentalist Hindus very happy.
To summarize:
(1) energy comes from the collision (not "something from nothing")
(2) inflation not required to match theory to observation
(3) dark matter not required to match theory to observation
(4) dark energy not required to match theory to observation
(5) it matches the "standard model" for the rest of the observations.
Occam's razor anyone?
Enjoy.
ps - it's "dimension"
we are limited in our ability to understand
by our ability to understand