In this work, we make use of the worldline formalism, and in concrete, the R representation, a new one that manifests the gauge invariant in the amplitude focus on the scalar QED to obtain the scattering at tree level, ...

The phenomenon of light has been studied for many years, from Compton scattering to light-by-light scattering in Quantum Field Theory. In the standard QFT formalism, with the use of Feynman’s rules, we can calculate several ...

This work is focused on the light-by-light scattering: in particular, we study N-photon amplitudes in the low energy limit at the tree-level and one-loop level. We explore the advantages of helicity formulas involving field ...