The Cachazo-He-Yuan formalism expresses tree-level scattering amplitudes as integrals localized on scattering equations.
For null or hard external momenta, the scattering equations are
(1)
They arise as stationary-point equations for the Koba-Nielsen exponent and are covariant under projective transformations of the insertion points.

Ancestors (6)

  1. Koba-Nielsen factor
  2. Bosonic string theory
  3. String theory
  4. Branches of physics
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