The amount of our universe that is beyond the dark horizon already is believed to be 250 times larger than the observable universe. From what we can see the universe curves only about .4%, If we are in a least curved portion of the universe. The rest of the 250 times larger universe we can not see, could allow room for a curved universe, which to those in the know is a game changer. In my opinion


The driver of an exponentially expanding universe is believed to be negative pressure and not density or local positive pressure. This describes the anti gravity effect which we call dark energy. In their opinion.