Photon-baryon sound speed
= Photon-baryon sound speed
{title2=$c_s^2$}
For baryon-loading ratio $R=3\rho_b/(4\rho_\gamma)$, the photon-baryon sound speed is $c_s^2=1/[3(1+R)]$.
= Photon-baryon sound speed
{title2=$c_s^2$}
For baryon-loading ratio $R=3\rho_b/(4\rho_\gamma)$, the photon-baryon sound speed is $c_s^2=1/[3(1+R)]$.