Timeline for Can one assign an equivalence principle of some kind to the EM field?

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9 events

when toggle format	what		by	license	comment
Apr 18, 2019 at 9:50	vote	accept	spacetimeengineer
Apr 11, 2017 at 14:11	comment	added	Valter Moretti		Equivalence principle is a statement in classical physics used (by Einstein) to construct general relativity. In general relativity it turns out to be encapsulated in the language itself and, more or less, it is stated saying that the stories of free falling bodies are geodesics of the spacetime.
Apr 11, 2017 at 3:52	comment	added	Shing		I am a bit confused, if the general law of motion is Newton's law F=ma, would you mind elaborating a bit on the reason that we can use Newton's law in general relativity?
May 30, 2014 at 22:16	comment	added	Valter Moretti		I was referring to geodesics in spacetime, the stories of particles. To fix one of them, you have to give the initial event and the initial tangent vector. The latter, referring to the proper time as parameter describing the geodesic is the four velocity which, in turn, is equivalent to the standard velocity in a any fixed reference frame. The fact that you need these two types of initial conditions is mathematically evident form the fact that the differential equation of geodesics is of second order.
May 30, 2014 at 21:51	comment	added	Larry Harson		I'm under the impression that geodesics depend only on the end positions, and not the velocity since this is just a rotation in space-time and won't affect a geodesic.
May 23, 2014 at 21:58	history	edited	Valter Moretti	CC BY-SA 3.0	added 1 character in body
May 23, 2014 at 21:50	history	edited	Valter Moretti	CC BY-SA 3.0	added 156 characters in body
May 23, 2014 at 16:36	history	edited	Valter Moretti	CC BY-SA 3.0	added 52 characters in body
May 23, 2014 at 16:29	history	answered	Valter Moretti	CC BY-SA 3.0