Гијом Трожани

10. априла 2024.

У оквиру семинара Групе за гравитацију, честице и поља Института за физику у Београду, у петак, 12. априла 2024. године у 11 часова, у сали 360 Института за физику у Београду, Гијом Трожани (Хериот-Ват Универзитет, Единбург, Уједињено Краљевство) одржаће предавање:

Perturbiner expansion: old and new


In their seminal, Berends and Giele identified an efficient algorithm for computing n-point tree level scattering amplitudes in gauge theory. Later,  the pertubiner expansion was developed to generate the Berends-Giele recursion relation to study any quantum field theory at tree level. This talk aims to reintroduce these techniques in the light of the modern language of homotopy algebras, with an eye towards the recent development of loop level techniques. Indeed, the recursion relations are natural consequences of the Homotopy perturbation lemma relating an interacting field theory and its underlying free theory. Time permitting, I will comment on current work where we apply this algebraic machinery to braided field theories, which are noncommutative field theories deformed in a controlled manner.