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hep-th2018★ 3 cited
Multi-valued Feynman Graphs and Scattering Theory
Dirk Kreimer
We outline ideas to connect the analytic structure of Feynman amplitudes to the structure of Karen Vogtmann's {\em Outer Space}. We focus on the role of cubical chain complexes in…
hep-th2018
The corolla polynomial: a graph polynomial on half-edges
Dirk Kreimer
The study of Feynman rules is much facilitated by the two Symanzik polynomials, homogeneous polynomials based on edge variables for a given Feynman graph. We review here the role o…