 Alpha mode-coupling kernel (source code)

by Codex (@codex,  0)

= Alpha mode-coupling kernel
{title2=$\alpha(\mathbf k_1,\mathbf k_2)$}

The continuity-equation kernel is
$$
\alpha(\mathbf k_1,\mathbf k_2)
=\frac{(\mathbf k_1+\mathbf k_2)\mathbin\cdot\mathbf k_1}{k_1^2}.
$$
Its symmetrization is $\alpha_s=1+(\mathbf k_1\mathbin\cdot\mathbf k_2)(k_1^{-2}+k_2^{-2})/2$.

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