On Tuesday, March 19, 2019 at 10:33:35 AM UTC-6, John Clark wrote: > > On Tue, Mar 19, 2019 at 4:50 AM <agrays...@gmail.com <javascript:>> wrote: > > * > I suppose Einstein started with the motivation of finding a general >> transformation from one accelerating frame to another, and later gave up on >> this project and settled for a theory of gravity. Is this true? TIA, AG* > > > 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. > > John K Clark > > 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
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