Kamran Salehi Vaziri, Manuel Loparco, João Miguel Augusto Penedones Fernandes
We study two-point functions of symmetric traceless local operators in the bulk of de Sitter spacetime. We derive the Kallen-Lehmann spectral decomposition for any spin and show that unitarity implies its spectral densities are nonnegative. In addition, we ...
Springer Nature2023
