@dalehileman,
dalehileman wrote:Ora this is very troubling. After circumnavigating the Universe when I encounter you once more you've aged eons while I've hardly aged at all even if I don't stop to chat. Thus wasn't it my acceleration that had caused my time to stop (relative to you and the rest of the Universe)
In your original question, you specified that the person circumnavigating the universe did not accelerate
at all, but was traveling fast (relative to most of the universe) to begin with.
In that case, it is the person who slowed to a stop (relative to most of the universe) who underwent acceleration and thus does not age.
I'm presuming that your hypothetical finite universe loops on itself so that if someone goes far enough in one direction they will eventually reach the same spot. If "circumnavigating the universe" involves changing direction, that's acceleration.