Is tachyon particle in WARP-bubble? Or is it rather a phenomenon than a particle? Or is tachyon only wave motion that travels just behind neutrino or some other particle? There is the possibility that the hypothetical tachyon particle does not exist. Or time-traveling tachyon particles do not exist. It's possible. That all hypothetical tachyons are not transporting information back in time. Or even if those particles transport information to the past, that information cannot interact with other particles. In that case, the faster-than-light particles are traveling back in time, but they cannot send their information to other particles. The reason for that is linear spacetime model causes a situation where regular, slower-than-light particles are traveling forward in time. And the hypothetical faster-than-light particle is traveling back in time. So those particles are like in elevators where another particle is traveling down, and another is traveling up. If tach...