Special Relativity vs. "Curled up" spacial dimensions To be more specific I mean the 3 familiar spacial dimensions not extra ones(unless I guess they are large enough for SR to be effective). Anyway, I was reading a book on Superstring Theory(Which is why I say not extra ones it proposed extra culred dimensions which if were sub-planck length would not be detectable to us), I don't have it with me to cite to author, but it said it hasn't been proven or disproven that the familiar spacial dimensions are or are not curled upon themselves. And so in theory you could return at the same point by going to a straight line. From what I know of SR and the constant motion clock examples two people with clocks floating in opposite directions through space would feel to be at rest with the other moving relative to them causing the slowing of time for each other but on a symmetrical basis so the paradox is negated due to the fact logistically it could not be compared accurately enough by either accelerating back causing the one accelerating to have agreed upon tile slowing, or a signal sent at light speed making up for the lag. So if we had an empty path(No gravitational influence or at least negligible) through the universe that was curled upon itself the two clock would eventually meet back up, each observer expecting the other to be behind theirs and find the clocks reading the same time. Since SR has been proven in many instances this should either disprove the theory of curled up spacial dimensions in which SR is at play...or there is more I don't know as I am I would say amatuer at best.