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I had heard of particles move faster than light' speed(tachyon). I wonder how can we detect it? Which machin and what measurement used to find them
Just change the category for the "chat". Tachyons don't run faster than light. Outside a specific theory, it is a broad notion. Before producing measures, you must be able to start a run and to detect something at another place, If it is possible, you need to describe precisely at least these 2 interfaces between the SM and this hypothetized world with faster than light signals ( speedyons ), Add to that that universal SR wouldn't hold anymore: you would have a SR for the S.M. interactions and another SR for the speedyons ones plus a glue theory for all that stuff. Anyway, never fall in too simple conclusions when time is involved..
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