Speaker
Description
I will present flow oriented perturbation theory (FOPT), a coordinate space analogue of time-ordered perturbation theory and loop-tree duality. Within this approach, a generic Feynman graph is mapped to a sum of all its possible different energy-flows respecting energy conservation at each vertex (strongly connected directed graphs). In the FOPT framework, the integrals associated with virtual and real corrections turn out to have the same integral measure. Hence, FOPT shows promising potential in the context of explicit phase-space integration with manifest cancellation of real and virtual singularities. Additionally, I will present a FOPT representation of the S-matrix that exhibits manifest infrared singularity factorization on a per-diagram level.
