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If you could somehow move faster than c, or just send a signal faster than c, then one can show that this also enables you to send a signal to your own past. This is explained http://en.wikipedia.org/wiki/Tachyonic_Antitelephone" .
Special Relativity does not really say that you cannot go faster than c. All it says is that c is an invariant speed and it says how space time coordinates transform from one frame of reference to another. It then follows that faster than c signals can be paradoxical, but http://arxiv.org/abs/gr-qc/0107091"
Also, note that you can make your travel time arbitraily close to zero by traveling close enough to the speed of light. So, in this regard, c in special relativity is similar to an infinite speed in classical mechanics. If you let c go to infinity in special relativity (and apropriately rescale some other physical variables in that limit), then you get classical mechanics. Not surprising, as in classical mechanics an infinite velocity is the invariant velocity.
Special Relativity does not really say that you cannot go faster than c. All it says is that c is an invariant speed and it says how space time coordinates transform from one frame of reference to another. It then follows that faster than c signals can be paradoxical, but http://arxiv.org/abs/gr-qc/0107091"
Also, note that you can make your travel time arbitraily close to zero by traveling close enough to the speed of light. So, in this regard, c in special relativity is similar to an infinite speed in classical mechanics. If you let c go to infinity in special relativity (and apropriately rescale some other physical variables in that limit), then you get classical mechanics. Not surprising, as in classical mechanics an infinite velocity is the invariant velocity.
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