For Stelle Quadratic Gravity, the paper proposes LSZ formulas built on Salvio's ghost-continuation prescription, yielding two quantization schemes whose amplitudes differ and a mode algebra with one undetermined sign.
Du ”Tree-level Graviton Scattering in the Worldline Formalism”
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Scattering amplitudes in Quadratic Graivty in a general formalism
For Stelle Quadratic Gravity, the paper proposes LSZ formulas built on Salvio's ghost-continuation prescription, yielding two quantization schemes whose amplitudes differ and a mode algebra with one undetermined sign.