On Fri, Jan 17, 2025 at 1:41 PM Alan Grayson <agrayson2...@gmail.com> wrote:
> > > On Friday, January 17, 2025 at 11:32:57 AM UTC-7 John Clark wrote: > > On Fri, Jan 17, 2025 at 12:31 PM Alan Grayson <agrays...@gmail.com> wrote: > > *> I am halfway through the video you posted. IMO, there can be several > ways to solve a problem and acceleration is one legitimate way because > there IS accelation for the traveling twin, and acceleration IS equivalent > to gravity, and gravity DOES slow clocks.* > > > *I may have missed a few but I think most of the diagrams posted so far in > this thread have involved flat Minkowsky space, they show how clocks and > measuring sticks would behave if you were in deep space far from any > gravitational field, but gravity curves spacetime. Special Relativity can > handle the acceleration of a rocket if it's well beyond the orbit of > Neptune, but not if it's close to the sun. Special relativity can't handle > gravity because that involves curved spacetime, and for that you need > General Relativity. Special Relativity has no explanation for why gravity > causes things to move the way that they do, but General Relativity does. * > > > > *IMO SR can handle curved spacetime. All one has to do is make the > partitions very fine, so we're approximating inertial motion along very > short paths. AG* > Curved spacetime is different from curved worldlines on flat spacetime--SR can deal with the latter but not the former. Think of the difference between curved paths in a flat 2D plane (Euclidean geometry) vs. paths on the curved 2D surface of a sphere (non-Euclidean geometry). Jesse > > *> I will finish the video out of curiosity for the author's supposed > solution, but it seems obvious that acceleration is one possible solution.* > > > *If you watch the rest of the video you'll see a modification of the > standard twin "paradox" that does not involve acceleration but produces the > same odd situation. * > > *John K Clark See what's on my new list at Extropolis > <https://groups.google.com/g/extropolis>* > 7c1 > > > -- > 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 everything-list+unsubscr...@googlegroups.com. > To view this discussion visit > https://groups.google.com/d/msgid/everything-list/131eccda-168e-41eb-b682-2eb8837c9394n%40googlegroups.com > <https://groups.google.com/d/msgid/everything-list/131eccda-168e-41eb-b682-2eb8837c9394n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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 everything-list+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/everything-list/CAPCWU3%2B4s1g4ANRvwS-H5yBM0bjY4AepR1ukur3POjCb2SN5bw%40mail.gmail.com.
