I've heard it said that relativity formally permits tachyons and that we don't believe they exist merely because there is no empirical evidence of them. However, since a tachyon's speed exceeds c, its γ must be imaginary. The t-component of the particle's 4-velocity is, depending on...
I've just started graduate school and have long had the intent of specializing in high-energy experiment, but lately I'm giving some thought to theory. First, here are some provisos. I know that academia is a very competitive game to begin with and that the competition in theory is absurd...