/sci/ - Science & Math

how would a universe with flat curvature even exist? If gravity and matter have to balance each other out then spacetime must fold in on itself at t=0 and should therefore have a positive curvature as time passes. Why is it that we still believe in a a zero curvature? I know that the planck measurements are indicating towards a flat universe but that can just be error on our part. A zero curvature universe means that matter dark energy has always existed in excess to the amount of gravity holding matter at the singularity which would explain why the universe banged yet fails to explain why did it begin in such a tiny amount in the first place. Did someone just turn on the dark energy switch at t=0? Even if they did, I don't see why the universe could be flat unless dark energy was infinitely stronger than gravity which it isn't apparently.