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The term massive particle refers to particles which have real non-zero rest mass (such as baryonic matter). According to special relativity, their velocity is always lower than the speed of light.[1] The synonyms bradyon (from Greek: , bradys, "slow"), tardyon or ittyon[2] are sometimes used to contrast with luxon (which moves at light speed) and hypothetical tachyon (which moves faster than light).

See also


  1. ^ Folman, R.; Recami, E. (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.
  2. ^ Bilaniuk, O.-M.P.; Sudarshan, E.C.G. (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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