What are tachyons
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In 1967 Gerald Feinberg of Columbia University wondered if it was right to do so. (Feinberg was not the first to suggest the particle, the merit being OM Bilaniuk and ECG Sudarshan.) But it was Feinberg who spread the idea.) It could be, he was said, that an "imaginary" mass and length were simply a mode of To describe an object with negative gravity (let us say): an object that, within our universe, repels matter rather than gravitationally attracts it.
Feinberg called tachyons to these particles faster than light and imaginary mass and length; The word comes from another that in Greek means fast. If we grant the existence of these tachyons, can they meet the requirements of Einstein's equations?
Apparently yes. There is no problem in imagining a whole universe of tachyons moving faster than light but still fulfilling the requirements of relativity. However, in terms of energy and speed, the situation is opposite to what we are accustomed to.
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