Analytical evaluation of cosmological correlation functions

A bstract Using the Schwinger-Keldysh-formalism, reformulated in [1] as an effective field theory Euclidean anti-de Sitter, we evaluate one-loop cosmological four-point function of a conformally coupled interacting scalar de Sitter. Recasting Witten correlator flat space Feynman integrals, functions Sitter terms single-valued multiple polylogarithms. From it derive anomalous dimensions and OPE coefficients dual conformal at space-like, future infinity. In particular, find interesting degeneracy relating operators neighboring spins.