I need to make a note of this for writing SF in the future:
This is, alas, apparently a misleading title. What we have is math that makes sense both below the speed of light and above the speed of light, with a discontinuity at “c”. It says. It’s not like I tried to look through the math, which is not presented in this little article anyway, except possibly if you click around through the offered links.
But whether or not any of this actually pans out, you can instantly see how well this kind of thing suits space opera FTL travel, with hyperspace and everything.