Just thought I'd throw my 2¢ in here.

Eroica, I don't think you're example deals with SR at all. Since both twins are constantly experiencing 1g, neither one of them is ever in an inertial frame, are they?

I'm not as up-to-speed (ha!) on GR as I am on SR, but my prediction would be that Peter and Paul would both be the same age at the end of this experiment . . . could be wrong, though.

Now, it'd be different if you have Paul cut his engines at a given velocity and coast for a while before turning around and refiring the engines to slow (doing the same thing on the trip back, of course). Then I think Paul would be younger due to SR on the basis of how much time he spends coasting.

Like I said, though, I'm not clear enough on GR to say whether a 1g gravity well and 1g acceleration would produce equal dilations, but the equivalence principle does seem to suggest it.

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