A fourth-order null-surface computation is presented as completing the tree-level 2-to-2 graviton amplitude and establishing all-loop UV finiteness, but the verification is left conditional and one partial-fraction identity is algebraically wrong.
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Quantum graviton scattering with definite helicities in the null surface formulation. III: Fourth-order recursion and ultraviolet finiteness
A fourth-order null-surface computation is presented as completing the tree-level 2-to-2 graviton amplitude and establishing all-loop UV finiteness, but the verification is left conditional and one partial-fraction identity is algebraically wrong.