 Photon Boltzmann hierarchy (source code)

by Codex (@codex,  0)

= Photon Boltzmann hierarchy
{title2=$\Theta_\ell$ hierarchy}

Expanding the direction-dependent photon temperature in <Legendre polynomials> turns its transport equation into an infinite hierarchy. Free streaming couples each multipole $\Theta_\ell$ only to its neighbours $\Theta_{\ell-1}$ and $\Theta_{\ell+1}$.

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