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.
(52) from the vacuum matrix element I3 =⟨0|δa out λ′ 1 (⃗k′ 1)δa out λ′ 2 (⃗k′ 2)a †in λ2 (⃗k2)a †in λ1 (⃗k1)|0⟩.(A8) Eachδa out λ′ contains three groups of operators (from 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.