Could our universe have collided with another, revealing the multiverse?
We also know that there’s a very important relationship between the expansion rate and the sum total of all the various forms of matter and energy present in the Universe: if they balance perfectly, the Universe can expand without either recollapsing or expanding into an empty oblivion; if they don’t, an almost immediate recollapse or an “emptying” of the Universe will occur. We know, looking back from our 13.
enabling a Universe that inflates in this fashion to be stretched flat, emptied of all pre-existing matter and radiation, and giving it the same properties everywhere, since everything that now occupies our observable Universe emerged from this once-tiny region of inflating space. and where there’s an observed maximum upper limit on how hot the Universe could have gotten in the earliest stages of the Big Bang, and that limit is significantly below the Planck energy scale.
and lead to a hot Big Bang for a region at least the size of a soccer ball, which was the minimum size for our Universe at the start of the hot Big Bang, Now, here’s a key part of inflation that most people don’t recognize: the hill has to have a certain set of properties so that the ball rolls slowly enough to give us enough inflation to give rise to our Universe as we see it. This places significant and meaningful constraints on the allowed shapes that the hill could possibly have, and in particular, this fact is true: the hill needs to be flat enough that the ball rolls slowly.
But you’ll also get regions where inflation doesn’t end at that time, and spreads back towards the flat part of the hill, where inflation continues for some additional time. In fact, working out the mathematics of this indicates quite strongly that:that where it does, inflation ends and we get a hot Big Bang,and in those regions, space expands exponentially, rather than at the rapidly decreasing rate that occurs in regions where you get a hot Big Bang.
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