Paper
Symmetries of de Sitter Particles and Amplitudes
Authors
Audrey Lindsay, Tomasz R. Taylor
Abstract
We discuss the symmetry aspects of quantum field theory in global four-dimensional de Sitter spacetime linked to isometries. For the unitary irreducible representations relevant to elementary particles, we obtain explicit transformation laws for the symmetry generators acting on one-particle states in a basis adapted to the decomposition of the Hilbert space. Using these results, we derive the corresponding Ward identities and demonstrate how global spacetime symmetries constrain de Sitter scattering amplitudes. We show that the Poincaré algebra and flat-space Ward identities are recovered in the large-momentum limit.