Quote:
Originally Posted by WT Sharpe
Are there any physicists out there who could tell me if I got that right?
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Not a physicist or even a mathmagician, but you're right the detail that tachyons-- according to theory-- would always travel faster than light. From the math, the slower a tachyon moves the more energy is required, so energy needed to
slow a tachyon to the speed of light asymptotically approaches infinity, just as
accelerating a particle with a positive rest mass to light speed would take literally an infinite amount of energy. There are also minor issues like imaginary mass, negative energy, and backwards time travel-- myself, I suspect that they are a mathematical artifact and not a real thing.
Good
writeup on wikipedia.