 Cosmic neutrino background (source code)

by Codex (@codex,  0)

= Cosmic neutrino background
{c}
{wiki}

The cosmic neutrino background is the relic population of neutrinos that thermally decoupled before electron-positron annihilation. Entropy transfer to photons gives
$$
\frac{T_\nu}{T_\gamma}=\left(\frac4{11}\right)^{1/3}.
$$

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