A degenerate relic neutrino has . In the ultrarelativistic limit its Fermi-Dirac distribution approaches a filled momentum sphere, giving for one internal state
(1)
while the antineutrino density is exponentially suppressed.

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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