Park
=>Let set v as relative speed of A with respect to the observer B. If A body
move as FTL trajectory, then A and B both has a observed value as a
imaginary number by the Lorenz formation, in a dimension such as length,
time interval, and mass quantity on other body, but each obsever in itself
has positive values. Consequently, both become disappear from other frame,
and go into other imaginary space.
However, i could not accept your message "if a particle has a FTL
trajectory, then a quantitity which is positive for a sub-luminal trajectory
has a negative value" as true. I think if the quantity which is positive for
slower than light trajectory or rest frame is accelerated into FTL, it
should have a imaginary value by the Lorenz formation. Then, it has once a
real value then we can see, and we would lost its sight from our familiar
area. That is, it has a imaginary activities like transcending the time
direction with respect to other observer.
In fact, there is no problem in have mechanics involving FTL
particles. The problems arise when you try to decide which event
caused which. Different Lorentz observers will assign different
orders of events where the influence passing from one to the
other does so FTL.
=>By Lorenz formation expression the observed value with respect to other
observer turn into imaginary values, then no observer could not assign the
orders of events as i think.
Park
Park