Anand, NikhilKhandker, Zuhair U.Walters, Matthew Thomas2020-11-242020-11-242020-11-242020-10-1510.1007/JHEP10(2020)095https://infoscience.epfl.ch/handle/20.500.14299/173586WOS:000582756700001We consider Lorentzian CFT Wightman functions in momentum space. In particular, we derive a set of reference formulas for computing two- and three-point functions, restricting our attention to three-point functions where the middle operator (corresponding to a Hamiltonian density) carries zero spatial momentum, but otherwise allowing operators to have arbitrary spin. A direct application of our formulas is the computation of Hamiltonian matrix elements within the framework of conformal truncation, a recently proposed method for numerically studying strongly-coupled QFTs in real time and infinite volume. Our momentum space formulas take the form of finite sums over F-2(1) hypergeometric functions, allowing for efficient numerical evaluation. As a concrete application, we work out matrix elements for 3d phi (4)-theory, thus providing the seed ingredients for future truncation studies.Physics, Particles & FieldsPhysicsconformal field theoryads-cft correspondencefield-theoryidentitiestext::journal::journal article::research article