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I know the question sounds crazy enough to laugh at. But what if it happens? Feel free to criticize and give some astounding answers!
There's a problem of getting 'over the fence' - to reach the speed of light you need infinite energy - in special relativity you have a 'gamma' factor which goes infinite when v=c .
And it gets weird from there, the energy amongst other quantities goes imaginary if v>c. Possibly such things could exists from the get-go and thus wouldnt have to cross the v=c barrier, the idea is called 'tachyons' but I blv. no evidence exists for them and its not clear if these should be detectable.
There will be a kind of Cherenkov effect as in all physical media where the speed of
the particle exceeds the speed of light.
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