Maybe enforcing the second law of thermodynamics? Or they're a consequence of the same. It's a region of space where the conditions that existed before the bi

Maybe enforcing the second law of thermodynamics? Or they're a consequence of the same. It's a region of space where the conditions that existed before the big bang have ostensibly reestablished themselves, which is why it appears as a 2d boundary phenomenon to us. I am a total crank.