A tachyon or tachyonic particle is a hypothetical particle that always moves faster than light. Most physicists believe that faster-than-light particles cannot exist because they are not consistent with the known laws of physics. If such particles did exist, they could be used to build a tachyonic antitelephone and send signals faster than light, which (according to special realtivity) would lead to violations of causality.
The possibility of particles moving faster than light was first proposed by O. M. P. Bilaniuk, V. K. Deshpande, and E. C. G. Sudarshan in 1962, although the term they used for it was"meta particle. "
The first hypothesis regarding faster-than-light particles is sometimes attributed to German physicist Arnold Sommerfold in 1904, and more recent discussions happened in 1962 and 1969.
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