Tight-coupling approximation
= Tight-coupling approximation
{wiki}
The tight-coupling approximation expands the photon-baryon Boltzmann equations in powers of $k/\Gamma$ and $\mathcal H/\Gamma$, where $\Gamma$ is the Thomson scattering rate.
= Tight-coupling approximation
{wiki}
The tight-coupling approximation expands the photon-baryon Boltzmann equations in powers of $k/\Gamma$ and $\mathcal H/\Gamma$, where $\Gamma$ is the Thomson scattering rate.