I'm not a physicist, but I think it is within.
At any rate, the Big Bang has nothing to do with evolution.
Not true at all. The big bang and the rate of expansion thereafter, set the constants known as the weak force, the strong force, electromagnetism which are the forces that hold all atoms and therfore all matter together. If the strong, weak, electromagnetism forces were not what they are no matter larger than subatomic particles could occur. Therefore no life or anything else would exist.