That's when stuff like "Feynman Curves" come up. That, if slingshotting back through time, one has to exactly follow their trajectory, course and speed in a reverse course in order to return to the version of the future they left.UFO said:But hold on a minute. If you travel into the past and create a new universe, travelling into the future will not take you back to the old universe but to the future of the new one, right? Crossing between universes would seem to be a different breed of animal.
Spock Prime has no such option, since his travel method cannot be duplicated exactly.
If Spock had used the slingshot method he could indeed reverse it to go into the future, but only within his current universe. Neither method of time travel involves crossing from one universe to another. Its the reaction of the universe to the time travel event that creates the branch (as I understand it) no matter what TT method you use.
To put it another way, reversing course can't first merge the alt universe with the prime one (which it would need to, though its still wouldn't help) because the original course didn't create the new universe. It only handled sending you back in time in the same universe. So reversing course will just send you forward to the future of the new universe (which then causes another branch of course).
I guess what I am suggesting here is that while establishing a two way connection between parent and child universes might cause them to merge, you would need a completely different technology to travel from one to the other first because no form of time travel seems able to achieve that.
Actually it could even be worse than that. The very act of jumping from one universe to another could cause the target (prime) universe to branch whereupon you would not end up in the target but an exact copy of it!
If it's a two-way link between the uptime and downtime points, then what will happen is, the new timeline you created downtime will have merged back in with your original timeline and then overwritten your original timeline's quantum information.
OK, well maybe I don’t understand what constitutes a "two-way" link. Do you actually have to go back to the your original universe or does the mere fact that you could theoretically do so somehow automatically create the merger? The link would have to span universes it seems to me, not just past and future points in the same universe. How can it do that when it didn't itself cause the split? As I say, the reaction of the universe did that. I would be like leaving a trail of bread crumbs when going from A to B on one island but when you go to B a giant lifted you up and placed you on a new island. How do your bread crumbs help then?
I'm saying that there is no way even theoretically for a TT mechanism to get you back to your old universe. Even if it could, when you get to the future, there’s that pesky branching again. You would still have to jump back across to the prime universe, which could create a new universe and so on ... . If there is no way to establish a two way link, there can be no mergers.
Maybe you just can't go home.
