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Moon Candy
2f4b71
Basically, you have FTL information transmission (spaceships, people, etc are included under 'information'), time travel, and General Relativity: pick two. No compromises, no 'you can sort of FTL but only in some ways', so 'you can only travel to someone else's past'. If you can send information outside your light-cone, and relativity is valid, then you can construct a scenario where you can send information to your past self.
The easiest way to avoid this is to declare GR invalid, give the universe a universal clock, and gloss over edge cases where GR applies in the real world (e.g. GPS satellite clocks no longer needing a fudge factor). No more Time Dilation, unfortunately.
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