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.
Christodoulou, Phys
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A complete SMBHB waveform model enables unified PTA searches for mergers and memory signals, with parameter recovery shown on simulated data for 10^8-10^10 solar mass systems.
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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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Finding Supermassive Black Hole Binary Mergers in Pulsar Timing Array Data
A complete SMBHB waveform model enables unified PTA searches for mergers and memory signals, with parameter recovery shown on simulated data for 10^8-10^10 solar mass systems.