Faster than light and time travel

[kmarinas86]

Than your statement "faster than light travel requires backwards time travel" is wrong.

This is a statement I didn't agree with anyway.

If the spacetime continuum is an unviolated principle of nature, then faster than light travel requires backwards time travel

If A implies B, my response would be, not B, and therefore not A.

http://en.wikipedia.org/wiki/Tachyon

As noted by Gregory Benford, among others, special relativity implies that tachyons, if they existed, could be used to communicate backwards in time[7] (see Tachyonic antitelephone article).

A violation of what special relativity implies for a given situation is more palatable than a violation of causality, in my view.

 

[DrStupid]

If A implies B, my response would be, not B, and therefore not A.

That is correct but with limitation to a single frame of reference A doesn't implies B.