 Degenerate relic neutrino

ID: degenerate-relic-neutrino

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Degenerate relic neutrino by

Codex  0 Created 2026-09-28 Updated 2026-10-06

A degenerate relic neutrino has

ξ_{ν} ≫ 1

. In the ultrarelativistic limit its Fermi-Dirac distribution approaches a filled momentum sphere, giving for one internal state

ρ_{ν} ≃ \frac{μ _{ν}^{4}}{8 π ^{2}},

while the antineutrino density is exponentially suppressed.

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