lepton era

lepton era

[′lep‚tän ‚ir·ə]
(astronomy)
The period in the early universe, following the hadron era, during which electrons, positrons, neutrinos, and photons were present in nearly equal numbers; roughly between 10-4 and 20 seconds after the big bang.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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