Séminaire Géométrie Topologie Dynamique
Ghost polygons, Poisson bracket and convexity
19
May 2022
 Intervenant : François Labourie Institution : Université Côte d'Azur Heure : 14h00 - 15h00 Lieu : 2L8

The moduli space of Anosov representations of a surface group in a group $\mathsf G$, which is an open set in  the character variety,  admits many more natural functions than the regular functions: length functions, correlation functions.  We  compute the Poisson bracket of those functions using some combinatorial device,  show that the set of those functions is stable under the Poisson bracket and give an application to the convexity of  length functions, generalizing the result of Wolpert on Teichmüller space.

We shall start by giving an introduction to Anosov representations, define precisely what are the functions we consider and explain the combinatorial device involved.

This is a joint work with Martin Bridgeman. The talk will be in English, with a strong French accent.