Second-order quantum graviton scattering in the null surface formulation yields perturbatively finite amplitudes that reproduce the s-channel Weinberg tree-level result in the Poincare limit via on-shell intermediate gravitons and Gaussian-smeared states.
(A4), only the terms inσ + 2 with time dependencee −iω′u andω ′ >0 contribute, namely Groups 1, 2, and 4, recovering Eq
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Quantum graviton scattering with definite helicities in the null surface formulation
Second-order quantum graviton scattering in the null surface formulation yields perturbatively finite amplitudes that reproduce the s-channel Weinberg tree-level result in the Poincare limit via on-shell intermediate gravitons and Gaussian-smeared states.