Either it would have negative mass and imaginary energy, or it has negative energy and imaginary mass - http://math.ucr.edu/home/baez/physics/ParticleAndNuclear

Either it would have negative mass and imaginary energy, or it has negative energy and imaginary mass - http://math.ucr.edu/home/baez/physics/ParticleAndNuclear/tachyons.html http://math.ucr.edu/home/baez/physics/ParticleAndNuclear/tac...