Photon number density ( $n_{γ}$ )

In natural units, a thermal photon gas with two polarizations has

n_{γ} = \frac{2 ζ ( 3 )}{π ^{2}} T^{3} .

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Baryon-to-photon dilution by entropy injection
Electron-positron equilibrium pair abundance below the electron mass
Past exam of the mathematics course of the University of Cambridge / 2018 / iii / Paper 310 / 3 / d / Solution
Past exam of the mathematics course of the University of Cambridge / 2019 / iii / Paper 310 / 2 / b / Solution

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