Twin Paradox (by acceleration)

[Aaron_Shaw]

and who happened to be momentarily adjacent at the instant they are both born,

Does this make sense as they are moving relative to each other? I don't think you can say this and then continue to calculate with accelerating frames assuming they started with a certain simultaneity.

 

[JesseM]

Does this make sense as they are moving relative to each other? I don't think you can say this and then continue to calculate with accelerating frames assuming they started with a certain simultaneity.

Why would it make a difference? Any physical situation can be analyzed using any frame you like, a frame is just a coordinate system for analyzing events in spacetime. And all frames agree about local events, so if it's true in one frame that their mothers were passing right next to each other at the moment each baby was born, then this is true in all frames.