Quote:
|
Originally Posted by Ryback
There is no equivalence here! The twin taking the space flight has to first accelerate to near the speed of light and then change acceleration to head back towards the earth. And then again he changes acceleration to slow down so he doesn't collide with the earth. His acceleration is not constant at all. The twin on the earth, on the other hand, experiences constant acceleration of 1g the entire time. There is no equivalence here and hence no problem.
|
I say that the acceleration does not change in magnitude, which is the important point. The GR effects of a gravitational field on one's clock are not dependent on the direction of the field, are they? I may be wrong, but I still contend that the GR effects on Peter's clock are identical to the GR effects on Paul's clock.