 Beta mode-coupling kernel (source code)

by Codex (@codex,  0)

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

The Euler-equation kernel is the symmetric function
$$
\beta(\mathbf k_1,\mathbf k_2)
=\frac{|\mathbf k_1+\mathbf k_2|^2
(\mathbf k_1\mathbin\cdot\mathbf k_2)}{2k_1^2k_2^2}.
$$

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