On Thu, Jan 16, 2020 at 1:25 PM Alan Grayson <[email protected]> wrote:
>> as Sean Carroll says "*the manifestation of spacetime curvature is >> simply the fact that space is expanding*". > > > *> If curvature is caused by energy and momentum in space-time, Carroll's > statement doesn't make sense. AG* Has it ever occured to you that if a professor of physics at one of the best universities in the world makes a statement about physics that makes no sense to you it might not be because he is talking nonsense but because you don't understand something? It makes no sense to you because you assume spatial curvature and spacetime curvature mean the same thing. But you're wrong, they don't. And they don't because the time dimension behaves in a fundamentally different way than any of the 3 spatial dimensions do; more specifically if you want to use Pythagoras theorem in space*TIME *(not to be confused with space) to calculate a distance in space*TIME* then you have to stick in a minus sign that Euclid and Pythagoras knew nothing about. John K Clark -- 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/CAJPayv2Yp%3DY4tgw0eozCpwsNanSDMepaCw05iHHk6GK3Y17Fug%40mail.gmail.com.
