On Sat, Jan 25, 2020 at 9:09 AM John Clark <[email protected]> wrote:
> > And I've heard a bunch of bad analogies but I still haven't heard a direct > answer to my question: > What is the difference between a "finite" universe that is expanding and > accelerating forever and an infinite universe that is expanding and > accelerating forever? > If you don't understand Brent's answer in terms of the range of values in coordinate maps, then you will never understand the difference. A finite universe has a finite range of coordinate values. Even if it is expanding exponentially, the range of coordinate values only ever increases at the same exponential rate -- i.e., never becomes infinite. In the case of an initially infinite universe, the coordinate range is necessarily infinite, and remains infinite even with expansion. Bruce -- 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/CAFxXSLTDTeOFyuh18Yj60ExA-fHe2-DsnQsYmaRrnq4FLnqrDg%40mail.gmail.com.
