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Originally Posted by Eroica
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Originally Posted by SeanF
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.
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[-X SeanF, SeanF, you surprise me! And to think that I was just waiting for you to leap to my defence 
You're absolutely wrong here. Of that I'm sure. I stand over my figures. Peter (the traveller) will age just 20 years, while Paul will age 3348 years.
Neither of the twins is in an inertial frame of reference. That's correct. But if the GR effects are the same, then the age difference can only be explained by SR. |
Sorry, Eroica!
I'm still working this one over in me little ol' mind here.
While Paul is rocketing away, experiencing his own little gravity well, wouldn't he say that since Peter is "below" him and getting farther and farther away, that Peter must be deeper in the gravity well? Now, when he's turned around and decelerating, Peter is "above" him and thus higher in the gravity well - but the difference in their heights (and thus the difference in Paul's opinion of the gravity well depth) is greater, so the GR-Paul-is-aging-faster wouldn't
exactly cancel out the GR-Peter-is-aging-faster.
If that's right, wouldn't that mean that GR predicts different ages? Or am I still missing something?
Don't get me wrong, I still think the twin paradox can be dealt with entirely within SR. I'm just still working through
this experiment of yours.
