High Quality Content by WIKIPEDIA articles! A tachyon is a
hypothetical subatomic particle that moves faster than light. 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 cannot slow down to subluminal speeds. The first
description of tachyons is attributed to German physicist Arnold
Sommerfeld. However, it was George Sudarshan, Olexa-Myron Bilaniuk,
Vijay Deshpande, and Gerald Feinberg (who originally coined the
term in the 1960s) who advanced a theoretical framework for their
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