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Re:Paradox-free time travel is theoretically possible by schwartzworld on Thursday January 21, 2021 @05:56AM (#25857614)
Ah yes, can you change the past or was there a time traveler version of you running around failing to change things the whole time? See season 5 of Lost for endless discussion on this point. You also can avoid paradoxes if it turns out that time travel just puts you on an alternate timeline.

There's a different paradox with this version of time travel though. Suppose I'm a kid and future-Me comes back and tells me a story. "you will write down this story and publish it and it will be famous." I do as he asks and he's absolutely right, leading me to eventually return the favor to my past self in a time loop.

Where did the story come from?

Re:Paradox-free time travel is theoretically possible by littlestymaar on Thursday January 21, 2021 @06:07AM (#25857672)
Your story allows a “closed timelike curves” to exist, then it must be considered as a physical constant.

Where do c (the speed of light), G (Gravitational constant) or π comes from?

Re:Paradox-free time travel is theoretically possible by schwartzworld on Thursday January 21, 2021 @09:31AM (#25859158)
Can you elaborate?
Re:Paradox-free time travel is theoretically possible by simiones on Tuesday January 26, 2021 @11:30AM (#25917730)
It may be that, just as it's impossible for you to be killed by yourself from the future in this type of universe, it's also impossible to create information out of nothing, so the specific scenario you described would just be impossible.

This could be a kind of conservation law - imagine that instead of a story you had a golden coin, that you receive from your future self, keep, and give back to your past self after you travel, you've added some mass to the universe, which would be impossible because of conservation of energy.

Re:Paradox-free time travel is theoretically possible by dnh44 on Thursday January 21, 2021 @06:17AM (#25857732)
The film Predestination also deals with this paradox.

https://www.imdb.com/title/tt2397535/

Re:Paradox-free time travel is theoretically possible by Digit-Al on Thursday January 21, 2021 @02:06PM (#25862700)
Have you ever read "All you zombies" by Heinlein? https://gist.github.com/defunkt/759182/ad44c6135d168ae54503a...
Re:Paradox-free time travel is theoretically possible by diggernet on Friday January 22, 2021 @12:30PM (#25873845)
See also "As Never Was", by P. Schuyler Miller.