 Scattering equation (source code)

by Codex (@codex,  0)

= Scattering equation
{wiki=CHY_formalism}

For null or hard external momenta, the scattering equations are
$$
\sum_{j\ne i}\frac{p_i\cdot p_j}{z_i-z_j}=0.
$$
They arise as stationary-point equations for the Koba-Nielsen exponent and are covariant under projective transformations of the insertion points.

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