[ahayes]

We don't know, because everything that we know about spacetime breaks down under the conditions of the Big Bang. It's similar to a black hole--you get a singularity where our laws no longer apply. This is one reason people are searching for a unifying theory that puts all of the information together and is capable of explaining what happens at a singularity.

[sirchtruth]

We don't know, because everything that we know about spacetime breaks down under the conditions of the Big Bang.

Ok, how do we know it "breaks" down, and what the conditions were of the BB?

I'm not following...unless you are talking about dimensions yet discovered?