| 单词 | tachyon |
| 释义 | tachyon A hypothetical particle that has a speed in excess of the speed of light. According to electromagnetic theory, a charged particle travelling through a medium at a speed in excess of the speed of light in that medium emits Cerenkov radiation. A charged tachyon would emit Cerenkov radiation even in a vacuum. No such particle has yet been detected. According to the special theory of relativity, it is impossible to accelerate a particle up to the speed of light because its energy E, given by E = mc2/v(1 - v2/c2) , would have to become infinite. The theory, however, does not forbid the existence of particles with v > c (where c is the speed of light). In such cases the expression in the brackets becomes negative and the energy would be imaginary |
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