Correct me if I’m wrong, but from my understanding, it’s only impossible for an object with mass to accelerate to the speed of light. If something was magically accelerated to above c, it wouldn’t break any rules to stay above c.
So what would happen in a collision between a slow object and something moving faster than c?
My guess is that faster than light and slower than light matter interactions are impossible.
So they would never interact, kind of like the way that a radio wave can slide directly through a sheet of metal.
Assuming that it did actually interact, I imagine the only reasonable outcome would be the spontaneous creation of a horde of naked singularities which would then almost immediately scab over into a plethora of black holes.
Yeah, no interaction at all is my best guess as well. Tachyons are the realm of some pretty weird shit. (And they probably don’t exist at all.) Imaginary mass and all that.