An addendum to my last post regarding tachyons. I think if a field could be created where tachyons, the quantum field type, occur very frequently then you would have the most awesome invincible shield. In empty space the tachyons would simple decay into typical background radiation but, when a weapon beam comes in range of the field the tachyons would take the form of the beam since that beam would then be the local minimum instead of empty space. This might, in effect, repel the incoming beam b/c the beam would essential be hitting something made of the same stuff. Just dreaming here though...no science to back that up:P