出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/07/30 13:34 UTC 版)
A tachyon (
/ˈtæki.ɒn/; Greek: ταχύς, takhus, "swift" + English: -on "elementary particle") is a hypothetical subatomic particle that moves faster than light. In the language of special relativity, a tachyon would be a particle with space-like four-momentum and imaginary proper time. A tachyon would be constrained to the space-like portion of the energy-momentum graph. Therefore, it cannot slow down to subluminal speeds.
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taipans
トートグ
tautogs
tuataras
tetras
テグー
tejus
キヌバネドリ