SO(1,4) isometries yield explicit transformation laws and Ward identities for de Sitter amplitudes that reduce to Poincaré invariance at high momenta.
Scattering of quantum particles in global de Sitter spacetime II: Scalars in deep infrared,
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Symmetries of de Sitter Particles and Amplitudes
SO(1,4) isometries yield explicit transformation laws and Ward identities for de Sitter amplitudes that reduce to Poincaré invariance at high momenta.