It's time travel, so game over for causality. You're fixated on the details of how you get there, and it is irreverent. No, it isn't necessarily time travel.

It's time travel, so game over for causality. You're fixated on the details of how you get there, and it is irreverent. No, it isn't necessarily time travel. See https://news.ycombinator.com/item?id=37013305 https://news.ycombinator.com/item?id=37013305 for my presentation of the standard argument that FTL leads to causality violations. Note that you need it to be FTL in more than one reference frame to do it. That's why, as I pointed out in https://news.ycombinator.com/item?id=37012594 https://news.ycombinator.com/item?id=37012594, FTL only in the fixed reference frame of the distant stars does NOT lead to causality violations. Again, we have no reason to believe that this is possible. But if it were possible, the standard objections would not apply. Word games with imaginary numbers. No, that's tachyons. This one was just negative numbers.