1) It's formula for time dilution. It's not applicable for a warp drive, because Alice will be shielded from relativistic effects, so no time dilution will occu

1) It's formula for time dilution. It's not applicable for a warp drive, because Alice will be shielded from relativistic effects, so no time dilution will occur. Alice's space will be dragged at speed > c, but Alice will live a normal life at normal speed, like a passenger in a supersonic airplane is protected from supersonic effects. 2) It's an unsolved problem because formula is defined for [0..c] only and for EM communication only. For a•v = c² it predicts dT=0, so time will stop for unshielded Alice, like it stops for photon, so she will not be able to communicate at all. For a•v > c², the formula is not defined at all (it is the unsolved problem). In reality, we expect to see Cherenkov radiation. In theory, according to this formula, EM processes should go in reverse, which is not possible at all, because it requires all photon emitted by Alice to reverse their direction and hit Alice at her new location.