Conformal Ward identities fix the leading soft limits of photon, gluon, and graviton correlators in (A)dS, and the subleading soft limit for gravitons.
Weinberg, Infrared photons and gravitons , Phys
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Soft Photon, Gluon and Graviton Theorems in (A)dS from Conformal Invariance
Conformal Ward identities fix the leading soft limits of photon, gluon, and graviton correlators in (A)dS, and the subleading soft limit for gravitons.