A tachyon (from the
Greek , takhyónion, from , takhýs, i.e. 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, Olexa-Myron Bilaniuk and
Gerald Feinberg (who originally coined the term) in the 1960s who advanced a theoretical framework for their study. Tachyonic fields have appeared theoretically in a variety of contexts, such as the
Bosonic string theory. In the language of
special relativity, a tachyon is a particle with space-like
four-momentum and
imaginary proper time. A tachyon is constrained to the
space-like portion of the energy-momentum graph. Therefore, it can never slow to light speed or below.
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is the name given by theoretical physicists to a hypothetical particle which can travel faster than light.
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