faster than light travel

the problem I see in faster than light travel is to get the square root of negative mass. Negative mass itself is fairly common as it happens in all transistors --in the quantum tunneling effect. In the region that is classically forbidden, the kinetic energy of the electron becomes negative. Therefore, its mass becomes negative. But that does not help for faster than light travel, since you would need to get the square root of that mass. The reason you cannot go at the speed of light is the mass would be infinite. But faster is okay if you can get to the square root of negative mass—i.e., the square root of 1-velocity divided by the phase velocity of light in vacuum [not the actual velocity. Phase velocity is not the packet velocity] ]