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Scattering Amplitudes from Intersection Theory (1711.00469v2)
Published 1 Nov 2017 in hep-th, math-ph, math.AG, and math.MP
Abstract: We use Picard-Lefschetz theory to prove a new formula for intersection numbers of twisted cocycles associated to a given arrangement of hyperplanes. In a special case when this arrangement produces the moduli space of punctured Riemann spheres, intersection numbers become tree-level scattering amplitudes of quantum field theories in the Cachazo-He-Yuan formulation.