On Tuesday, July 7, 2020 at 8:50:50 PM UTC-6, Alan Grayson wrote: > > > > On Tuesday, July 7, 2020 at 8:05:28 PM UTC-6, Bruce wrote: >> >> On Wed, Jul 1, 2020 at 4:18 PM Alan Grayson <[email protected]> wrote: >> >>> How, exactly, is the Principle of Equivalence used by Einstein to >>> develop GR? TIA, AG >>> >> >> >> This lecture by Sean Carroll should answer all your questions: >> >> URL: https://wp.me/p2WMeM-3vl >> >> Bruce >> > > I'll watch it tonight, but I think I've figured it out; specifically, the > EP implies space-time is curved by the presence of mass/energy (and this is > independent of the need to express the laws of physics in a coordinate > independent way via tensors). AG >
Here's my reasoning regarding the EP; if an observer is in a box subject to uniform acceleration, a beam of light starting on the extreme left side (moving transverse or perpendicular to the acceleration vector), will hit a lower point on the right side, showing that uniform acceleration results in curved paths in space-time. But if this result is identical to gravity, locally, it means that curved paths in space-time are produced by, or are equivalent to gravity. BUT gravity is only observed in the presence of mass/energy. ERGO, the EP implies mass/energy curves space-time. AG -- 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/09b42d61-2143-4788-8a85-e8fdbdef6e2fo%40googlegroups.com.
