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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