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Tachyon
A tachyon (from the Greek (takhĂşs), meaning "swift, fast") is any hypothetical particle that travels at superluminal velocity. The first description of tachyons is attributed to German physicist Arnold Sommerfeld, but it was George Sudarshan and Gerald Feinberg (who originally coined the term) in the 1960s who advanced a theoretical framework for their study.
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