The origin of the KLT relations and nonlinear relations for Yang-Mills amplitudes
arXiv:1910.13519 · doi:10.1016/j.physletb.2020.135299
Abstract
By means of a kinematic analysis of tree level graviton amplitudes we find, at least through six points, that the reason of their decompositon as a sum over products of Yang-Mills amplitudes is on-shell gauge invariance and unitarity. As a by-product of our analysis we find nonlinear relations obeyed by Yang-Mills amplitudes. All our results are valid for arbitrary spacetime dimensions.
arXiv commentSome corrections done. Accepted for publication in PLB
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