Why Tachyons Aren't Allowed in Physics Theory

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Why NO tachyons ??

my question is why are Tachyons NOT allowed to exists in physical theories ??

they would be particles with speed faster than light.. is this the main reason ?? could be they detected someday in accelerators, how does Standard model of particles interact with Tachyons.
 
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Who said there were no tachyons? As far as I know the existence of tachyons is an open question. The difficulty appears to be that if there were tachyons, we would have no way of detecting them. And some people assert that, for that reason, as far as our "universe" is concerned, they don't exist.
 


HallsofIvy said:
The difficulty appears to be that if there were tachyons, we would have no way of detecting them.
Why?
 
I am not sure if this falls under classical physics or quantum physics or somewhere else (so feel free to put it in the right section), but is there any micro state of the universe one can think of which if evolved under the current laws of nature, inevitably results in outcomes such as a table levitating? That example is just a random one I decided to choose but I'm really asking about any event that would seem like a "miracle" to the ordinary person (i.e. any event that doesn't seem to...
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