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originally posted by: Quadlink
I think time travel is somehow a different timeline and possibly interdimensional..... it gets deep dont ask me to explain i will get a headache
originally posted by: bloodymarvelous
Now let's add quantum mechanics. In quantum mechanics, some of what quanta do is truly random. Infinitely random. Has absolutely nothing to do with the quanta's previous state.
So let's repeat this experiment.
Suppose you go back in time and kill Hitler before he can become famous.
So: 1. Hitler dies young. A new time line emerges, with no Hitler in it.
2. Your future self (if you are still born) doesn't know about Hitler, and doesn't go back in time to kill him. (Saving his life by inaction.)
3. The original time line is restored, starting from the moment Hitler should have died in time line #2.
However, because some of what happens is perfectly random, the original time line doesn't progress in an exactly identical manner. Your future self may, or may not choose to go back in time and kill Hitler. (Indeed you may or may not still be born if a different sperm finds a different egg.)
Maybe you do still kill Hitler. Maybe you don't. But the loop is no longer an infinite loop. Even if it takes a trillion tries, time will simply re-roll the quantum dice until a consistent timeline emerges.
(Many of the random outcomes that lead to consistent timelines are not very happy outcomes for the time traveler....)