Using Light as a absolute frame of reference?

[FrancisClinton]

Each object just responds to the geometry of spacetime where it is located. The bending of the spatial path of the object is the overall result of the object following the local geometry along its entire path. The reason the spatial bending is different for objects with different velocities is that those objects are following different paths through the same spacetime geometry.

can you explain this with an example , the word " responds" you used in the explanation seemed to be more abstract.

 

[PeterDonis]

the word " responds" you used in the explanation seemed to be more abstract.

"Responds" just means that the local spacetime geometry at a given point determines the geodesic trajectory that the object will follow, given the object's velocity at that point.

 

[FrancisClinton]

okay i understood it , but does Einstein got all this idea from the thought experiment "Equivalence principle "?

 

[PeterDonis]

does Einstein got all this idea from the thought experiment "Equivalence principle "?

No. He only got a small piece of it. To get the rest took him about eight years (from 1907, when the basic insight that underlies the EP occurred to him--"when a person falls freely, he will not feel his own weight"--to the final form of the Einstein Field Equation in 1915).

 

[FrancisClinton]

No. He only got a small piece of it. To get the rest took him about eight years (from 1907, when the basic insight that underlies the EP occurred to him--"when a person falls freely, he will not feel his own weight"--to the final form of the Einstein Field Equation in 1915).

Yes he worked 8 years for the general relativity and had more struggles to prove it experimentally. I saw it in a documentary about einstein.

 

[Herman Trivilino]

Yes he worked 8 years for the general relativity and had more struggles to prove it experimentally. I saw it in a documentary about einstein.

Well, the struggles to prove it were not Einstein's. Those were efforts by others. Although Einstein did watch closely. And there are cases where he actively sought out experimentalists because he was keenly interested in their experimental techniques and results.