The physics technical term massive particle refers to a massful particle which has real non-zero rest mass (such as baryonic matter), the counter-part to the term massless particle. According to special relativity, the velocity of a massive particle is always less than the speed of light. When highlighting relativistic speeds, the synonyms bradyon (from Greek: βραδύς, bradys, “slow”), tardyon or ittyon are sometimes used to contrast with luxon (which moves at light speed) and hypothetical tachyon (which moves faster than light).
See also
References
- Ron Folman; Erasmo Recami (1995). "On the Phenomenology of Tachyon Radiation". Foundations of Physics Letters. 8 (2): 127–134. arXiv:hep-th/9508166. Bibcode:1995FoPhL...8..127F. doi:10.1007/BF02187583. S2CID 2758139.
- Martin Gardner (2008) . "Professor Cracker's Antitelephone". The Jinn From Hyperspace. Prometheus Books. p. 119. ISBN 978-1-59102-565-8.
Just as ordinary particles ('tardyons') can never be accelerated to the speed of light, so tachyons can never be slowed down to the speed of light.
- Olexa-Myron Bilaniuk; E.C. George Sudarshan (1969). "Particles beyond the Light Barrier". Physics Today. 22 (5): 43–51. Bibcode:1969PhT....22e..43B. doi:10.1063/1.3035574.
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