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Old Aug 27th 2019, 08:11 AM   #1
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Twins contradiction

Using Einstein's concepts I cannot make any sense of the following simple scenario.
There are two identical twins at rest in an inertial reference frame F0. They are separated by a distance L along the x-axis. When they turn 20 years old, they simultaneously step on to an inertial reference frame, F1, that has a relative velocity V along the x-axis with respect to frame F0. Per Einstein, the twins are no longer the same age. How can that be?
Any insights would be appreciated.
Thanks,
David Seppala
Bastrop TX
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Old Aug 28th 2019, 04:13 AM   #2
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One point is that many of these thought experiments that require instantaneous changes of velocity can give odd results.
But you are specifying unrealistic conditions (instantaneous acceleration) so you can expect unrealistic results.

Another point might be, are you sure you have interpreted the scenario correctly?

Also how did the twins get separated by the distance L, in reference frame F0,
without relative acceleration, and thus a relative change of age?
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