Séminaire à venir - Décembre
- 12/12/2018 - Karen Vogtmann (University of Warwick) - salle 05
Titre: Feynman diagrams and Outer space.
Resumé: Recent papers (including works by Kreimer, Bloch and Kreimer, Berghoff and Borinsky) have shown that rules used by physicists for computing Feynman amplitudes in quantum field theories are closely related to the combinatorial structure of various spaces of finite metric graphs that are used in geometric group theory to study automorphism groups of free groups. I will attempt to explain this relationship and to indicate ways in which it can be useful.