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.
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The paper analyzes total gravitational energy and its flux in asymptotic regions of radiative spacetimes to provide a theoretical basis for assessing gravitational radiation's contribution to cosmological acceleration.
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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.
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The Role of Gravitational Energy Flux in Cosmic Acceleration
The paper analyzes total gravitational energy and its flux in asymptotic regions of radiative spacetimes to provide a theoretical basis for assessing gravitational radiation's contribution to cosmological acceleration.