"We don’t (yet) have any way to test this, but University of Adelaide
applied mathematicians are suggesting that an extended version of
Einstein’s Theory of Special Relativity also holds true for
velocities
beyond lightspeed.

One of the main predictions of Special Relativity is that the speed
of
light is treated as an absolute cosmic speed limit, the line which
can
never be crossed; and even the notorious “faster-than-light neutrino”
incident in 2011 has left the theory intact as one of the most robust
in physics.

However, during the speculation that surrounded the neutrino
discussion last year1, the University of Adelaide’s Professor Jim Hill
and
Dr Barry Cox considered the question of how the mathematical
contradictions posed by a faster-than-light particle could be aligned
with
Special Relativity.

Their solution, which Professor Hill discussed with The Register,2
rested
on ignoring the speed of light’s status as an absolute limit, and
instead,
using the information where the relative velocity of two observers is
infinite.3."

See:

http://www.theregister.co.uk/2012/10...y_mathematics/