Topical Seminar: Flow-Oriented Perturbation Theory

por Alexandre Salas-Bernárdez (IFIC UV-CSIC)

lunes 11 mar. 2024 15:00 → 16:00 Europe/Madrid

Primera-1-1-1 - Paterna. Seminario (IFIC)

Flow Oriented Perturbation Theory (FOPT) is a novel approach to Feynman diagrams based on the coordinate (position) space description of Quantum Field Theories (QFT). It is 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.

FOPT offers interesting features regarding the computation of higher-loop Feynman amplitudes such as combinatorial and canonical Feynman rules, explicit infrared singularity factorization on a per-diagram level and the potential to have manifest cancellation of real and virtual singularities.

I will conclude by discussing the extension of FOPT to massless fermion fields and indicate steps towards the treatment of massive lines in arbitrary dimensions.

Based on https://arxiv.org/abs/2210.05532

 

AlexandreSalasIFICMarch13.pdf