Or one might guess that tachyons should be electrically neutral, like neutrinos. If tachyons were electrically charged, they could produce Cherenkov radiation in empty space. If an electrically charged particle moves faster than the speed of light in a given medium (which is allowed by special relativity), it makes the optical analog of a sonic boom, a cone of light called Cherenkov radiation. To answer your question, we have to ask: What kind of particle might be a tachyon? We also have to guess how tachyons would behave, since all known particle interactions obey the laws of special relativity. How particles are detected depends on properties other than their velocity. And because the existence of a tachyon is inconsistent with Einstein’s remarkably successful theory, a claim of tachyon detection would require extraordinary evidence. Normally, events only depend on what happened in the past, but aspects of Einstein’s theory imply that some observers would see a tachyon detected before it’s produced. The existence of tachyons can lead to “time travel” paradoxes. In Einstein’s theory of special relativity, only massless particles like the photon travel at the speed of light all other particles travel slower. Tachyons are hypothetical particles that travel faster than the speed of light in a vacuum.
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