On Tue, Mar 19, 2019 at 7:54 PM <[email protected]> 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 -- 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.
