Photon-baryon sound speed ( $c_{s}^{2}$ )

For baryon-loading ratio

R = 3 ρ_{b} / (4 ρ_{γ})

, the photon-baryon sound speed is

c_{s}^{2} = 1/ [3 (1 + R)]

.

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Baryon Jeans length across recombination
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