On 7 March 2014 06:01, Jesse Mazer <laserma...@gmail.com> wrote: > > On Thu, Mar 6, 2014 at 11:02 AM, Edgar L. Owen <edgaro...@att.net> wrote: > >> Liz, >> >> Sure, but aren't the different lengths of world lines due only to >> acceleration and gravitational effects? So aren't you saying the same thing >> I was? >> > I'm ignoring gravitation for the sake of simplicity, so the differences in length of world lines is indeed due to acceleration. However the time difference is not directly caused by acceleration, which was my point. The same acceleration can be used to produce different lengths of world line, for example one twin can go back and forth within the solar system while the other one accelerates to near light-speed and travels to a nearby star and back. The resulting time difference will always be related to the lengths of the world lines, (which in special relativity is an absolute measure everyone will agree on).
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