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About faster than light... I know (in fact I am currently yet studying) different extensions of relativity. Some options naturally arise: 1) Yes, Ben... Sudarshan's (and Recami's) Meta-relativity is one "option", somewhat oldfashioned. Problems: tachyons have not been observed in Nature yet. metarelativity paper metarelativity paper 2012 2) Carlos ...

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Nice question. I don't understand the Lorentz-violating possibilities very well, so I'll only try to comment on Lorentz-invariant theories. The classic papers are Tolman 1917, Bilaniuk 1962, and Bilaniuk 1969. Bilaniuk 1969 can easily be found online by googling, and gives a good overview. Tolman proposed a causality paradox involving tachyons, known as ...

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There's no related exception for tachyons. Tachyons' statistics must be determined a priori. Most typically, tachyons have to be bosons – and under certain additional assumptions, they have to be scalar (spin-zero) bosons. They differ from massive bosons just by the fact that the mass term $m^2\phi^2/2$ has the opposite sign – opposite sign of their $m^2$. ...

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But in the particle's rest frame, the process is absorption rather than emission, and it can't have some fixed rate. Welcome to the joys of non-locality, where the picture of emission and absorption of a tachyon particle travelling from A to B doesn't really work: If we go to the critical frame, a tachyonic interaction looks like an instantaneous ...

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One of the consequences of the FTL motion is that there is always a reference frame where the object is at different places at the same time. This is opposite to the time-like motion, where there is always a frame where object is at the same place in different times. Now consider the structure of proton. It is known that the number of observed proton ...

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