Why our universe continues to expand at an ever faster rate (?)

What is Bose Einstein Condensate?

Bose Einstein Condensate (BEC) is a "fifth" form of matter. It is matter cooled to absolute zero (see the link). Now, if you search around on this same website, it will discuss the size of the universe and that it is expanding ever faster. Why would all the matter in the universe (dark, normal and strange) force itself to accelerate? Something beyond the boundary of our universe should be pulling, by all logic.

What if "outside" of our universe, it is all BEC? No energy has hit it yet, so it must be at absolute zero. Once the universe expands to that point, the BEC "warms up" a bit and becomes space as we know it. Does that mean that there's an infinite amount of BEC out there? What if there is "space" beyond the BEC, from a former universe that cooled out of existance? Then it would be like the ripples on the surface of a pond...waves of BEC interspersed with normal space.

Anyway. There's a highly-caffienated thought for the morning.