On Sun, Sep 15, 2024 at 3:26 AM Alan Grayson <[email protected]> wrote:
> *I prefer approximately spherical compared to flat because as we go > backward in time, we can enclose the universe in a sphere, implying it > is finite in spatial extent (not infinite).* *There is no such implication. If the universe is a 3-sphere then it could be finite or infinite. A 3-sphere is a compact, connected, 3-dimensional manifold without boundary embedded in 4-space, any loop on a 3-sphere can be continuously shrunk to a point without leaving the 3-sphere.* * > It then occurred to me that the Unobservable universe was plausibly > created during Inflation, * *NO. The rate of expansion during inflation was mind blowingly gargantuan, but it was finite. If the universe was infinite before inflation then it was infinite after it, and if it was finite before inflation then it was finite after it. * *> to Alan Guth. I asked him, when he assumes the universe was around the > size of a proton when Inflation began, was he referring only to the > Observable universe,* *I know for a fact Guth was referring to the observable universe because he's a good enough physicist to know that a proton and the observable universe have one thing in common, both of them are finite in size. And no physical process can turn a finite thing into an infinite thing. * * > or both hypothetic parts, Observable and Unobservable. * *If the universe has any curvature at the largest possible scale it is unobservable, and if you insist that postulating that something you cannot observe and will never be able to observe nevertheless exists is unscientific, then you would have to conclude that the pope was right and Galileo was wrong because the Earth really is the center of the universe. Do you really want to insist on that? * John K Clark See what's on my new list at Extropolis <https://groups.google.com/g/extropolis> uss > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAJPayv3hPmd-V4p9a93iN_Q%3D4Q4NDhsdxcOkvEGGghMQ0w0YVw%40mail.gmail.com.
