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.
Quantizing with a higher time derivative
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We review the classical and quantum theory of the Pais-Uhlenbeck oscillator as the toy-model for quantizing f(R) gravity theories.
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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.