This "FTL == Time-Travel" thing still does not make sense to me.
Seriously do you need to have the equations and/or diagrams in front of you for it to make sense? Because many, many smart people agree that it totally makes sense, but no explanation I've found conveys this in a way I can understand.
The simplest version makes FTL sound like you're Blue Skidooing into the image of what is in the distance, which I am pretty sure is not how it works and is probably a bad explanation made by Relativistic Greenbelts.
There's two scenarios worth making sense of. I sorta-kinda get the wormhole variant: accelerate one end of the wormhole to Relativistic speeds, let the ends get far enough out of sync that travel time through the wormhole cannot compensate. It still feels like there's a section labeled "then it works this specific way, but we're skipping the explanation", but I will assume that the explanation for why out-of-sync wormholes mess with time is clear in the math.
What about the other, more popular example? I can't exactly summarize it, because every version I've read is too confusing to follow. But it apparently also works with only FTL communication, rather than shenanigans with accelerating at a certain point from a certain frame then turning around or <c:\windows\media\ding.wav>.
So I guess there are three examples, but the underlying principal is that "c is the speed of causality; don't question it."
Can someone at least get the examples to make sense?
Wormholes, accelerate one end and get them out of sync, then put them closer together than the amount of time they're out of sync minus transit time. Still confusing but halfway comprehensible.
Take your warp drive from A to B, then go back to A. Surprise: you went back in time somehow. I am completely lost.
You have an ancible. Or However you spell that. You can call someone on Mars, and communicate with no lag. Somehow you're calling the past / future. How does this make any sense?
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