A nonzero neutrino chemical potential produces unequal neutrino and antineutrino densities and hence a cosmological lepton asymmetry. It changes the radiation density, and an electron-neutrino asymmetry also changes neutron--proton weak equilibrium during Big Bang nucleosynthesis.

Ancestors (8)

  1. Neutrino degeneracy parameter
  2. Cosmic neutrino background
  3. Thermal decoupling in cosmology
  4. Cosmological entropy conservation
  5. Cosmology
  6. Branch of physics
  7. Physics
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