Big Bang Nucleosynthesis and neutrino-decoupling data pin the early-universe electron mass to 0.504-0.510 MeV, within about 1.4% of the present laboratory value.
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Early-universe constraints on the electron mass
Big Bang Nucleosynthesis and neutrino-decoupling data pin the early-universe electron mass to 0.504-0.510 MeV, within about 1.4% of the present laboratory value.