“lepton era”的概念、定义、翻译、参考文献-科学参考

lepton era

Astronomy

The interval, commencing about 10⁻⁵ s after the Big Bang, in which the various kinds of lepton were the main contributors to the density of the Universe. Pairs of leptons and antileptons were created in large numbers in the early Universe but, as the Universe cooled, most lepton species were annihilated. The lepton era immediately followed the hadron era, and is a subdivision of the radiation era. The end of the lepton era is usually taken to have occurred when most electron–positron pairs were annihilated, at a temperature of 5 × 10⁹ K, about 1 second after the Big Bang.

单词	lepton era
释义	lepton era Astronomy The interval, commencing about 10⁻⁵ s after the Big Bang, in which the various kinds of lepton were the main contributors to the density of the Universe. Pairs of leptons and antileptons were created in large numbers in the early Universe but, as the Universe cooled, most lepton species were annihilated. The lepton era immediately followed the hadron era, and is a subdivision of the radiation era. The end of the lepton era is usually taken to have occurred when most electron–positron pairs were annihilated, at a temperature of 5 × 10⁹ K, about 1 second after the Big Bang.
随便看	positive definite positive direction positive discrimination positive displacement pump positive display positive economics positive feedback positive fragment positive freedom positive glow positive introspection positive inversion positive ion positive law/positive theology positive lens positive logic positively oriented positively skewed positive paradox positive phase sequence positive photoresist positive selection positive semidefinite positive-sense((in genetics)) positive sequence