On Tuesday, July 7, 2020 at 10:06:44 PM UTC-6, Alan Grayson wrote: > > > > 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 >
For Bruce; so far I've gotten about two-thirds through Carroll's video. Will complete it this weekend. I sense a flaw in GR, suggested by the inclusion of G, the gravitational constant. How can a constant inferred from an approximate theory of gravity, Newton's Theory of Gravitation, be included in a presumed perfect theory of gravity, General Relativity? Don't you think something very subtle is awry here? 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/ffbbc9e9-1ba7-4410-8009-d76cf4ec12e6o%40googlegroups.com.
