Seminars are given every Friday from 2:00 to 3:00 in room 178. You are welcome 10 minutes earlier for tea, coffee and cake.

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Next talks:

Vendredi 12 juillet 2019 - On (Feynman) graphs, ribbon graphs and tensor graphs - Adrian Tanasa (LaBRI).
In this talk I will define the so-called Feynman graphs, which are a particular class of graphs appearing in quantum field theory. Ribbon graphs (or fat-graphs or graphs on surfaces), which appear as Feynman graphs of the so-called matrix models, will then be defined. I will then introduce tensor graphs, which are a natural generalization of ribbon graphs. These tensor graphs are Feynman graphs of the so-called tensor models. In the last part of the talk I will present several results on tensor graphs, such as the identification of the class of dominant graphs in a particular expansion of these tensor models.


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