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$\mathcal{N}=7$ On-Shell Diagrams and Supergravity Amplitudes in Momentum Twistor Space
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abstract
We derive an on-shell diagram recursion for tree-level scattering amplitudes in $\mathcal{N}=7$ supergravity. The diagrams are evaluated in terms of Grassmannian integrals and momentum twistors, generalising previous results of Hodges in momentum twistor space to non-MHV amplitudes. In particular, we recast five and six-point NMHV amplitudes in terms of $\mathcal{N}=7$ R-invariants analogous to those of $\mathcal{N}=4$ super-Yang-Mills, which makes cancellation of spurious poles more transparent. Above 5-points, this requires defining momentum twistors with respect to different orderings of the external momenta.
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Symplectic Grassmannian description of the Coulomb branch three and four point amplitudes
Three- and four-point Coulomb branch amplitudes of N=4 SYM are expressed as symplectic Grassmannian integrals over SpGr(3,6) and SpGr(4,8), up to a fitted kinematic factor at four points.
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