On Wednesday, March 20, 2019 at 7:03:48 AM UTC-6, John Clark wrote: > > On Tue, Mar 19, 2019 at 7:54 PM <[email protected] <javascript:>> wrote: > > >> Einstein's breakthrough, what he called "the happiest thought of my >>> life" was when he realized a man in a falling elevator will not feel >>> gravity but a man in a accelerating elevator will. In other words an >>> accelerating frame and gravity are the same thing, that's why it's called >>> the Equivalence Principle. >>> >> >> > >> *I think your claim, in response to my question, is that if you have a >> theory of gravity, then via the EP you also have a general theory of how to >> transform from one accelerating frame to another which obeys the Principle >> of Relativity. I tend not to believe this since gravity is only locally >> equivalent to acceleration. AG * >> > > Einstein was certainly aware that the EP was only true for regions that > were very small compared to the curvature of the gravitational field, in > fact working out the consequences of tidal effects was one of the reasons > it took him nearly a full decade of grueling work to go from "the happiest > thought of my life" to a fully developed theory of General Relativity. > Einstein had to master how 4D Tensors work in Non-Euclidean space and was > so obsessed and worked so hard it nearly killed him. When he finished he > lost nearly 50 pounds felt weak and expected to die soon, but fortunately > didn't. > > John K Clark >
But getting back to my original question a few messages ago; if there is no general transformation from one accelerating frame to another (except locally), how does GR establish the Principle of Relativity (for accelerating frames)? 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 post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
