Derives LSZ rules for graviton scattering in quadratic gravity using a covariant quantization that continues ghost variables to imaginary values after mean values are taken.
Du ”Tree-level Graviton Scattering in the Worldline Formalism” arxiv:2308.11326
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Scattering amplitudes in Quadratic Graivty in a general formalism
Derives LSZ rules for graviton scattering in quadratic gravity using a covariant quantization that continues ghost variables to imaginary values after mean values are taken.