What Is the Lepton Epoch? A Guide to the Early Universe’s Lepton-Dominated Era
The lepton epoch was a brief but pivotal period roughly 1–10 seconds after the Big Bang, when electrons, positrons, and neutrinos dominated the universe. It set the stage for neutrino decoupling, the annihilation of electron-positron pairs, and the primordial conditions that led to Big Bang nucleosynthesis.