Organizers: Anna Erschler, Cyril Houdayer and Corentin Le Bars

Funded by ERC Advanced Grant NET

One afternoon per month, 14:00-17:00, DMA, room W, École normale supérieure

Wednesday April 8

14:00-14:45 Adrien Boyer (Université Paris-Cité)

Property RD and boundary representations for A2 buildings

15:00-15:45 Julien Marché (École normale supérieure)

Action of endomorphisms of free groups on their SL2-character varieties

16:15-17:00 Greg Patchell (University of Oxford)

A new source of purely matricial field groups

Wednesday March 18

14:00-14:45 Xenia Flamm (Max Planck Institute Leipzig)

Positive representations and non-Archimedean ordered fields

15:00-15:45 Vlerë Mehmeti (École normale supérieure & Sorbonne Université)

Variation of the Hausdorff dimension and degenerating Schottky groups

16:15-17:00 Anna Ben-Hamou (Sorbonne Université)

Mixing time of a random walk on binary matrices

Wednesday February 18

14:00-14:45 Jean Lécureux (Université de Bordeaux)

A simple lattice in an affine building

15:00-15:45 Adrien Le Boudec (CNRS & École normale supérieure de Lyon)

Solvable groups with a common cocompact envelope

16:15-17:00 Vadim Kaimanovich (Université de Rennes)

Collapsing harmonic measures for discrete subgroups of semisimple Lie groups

Wednesday January 28

14:00-14:45 Naomi Andrew (Université Paris-Saclay)

Automorphisms behaving badly

15:00-15:45 Basile Morando (École normale supérieure)

On factoriality of the Neretin group von Neumann algebra

16:15-17:00 Nicolas de Saxcé (CNRS & Université Sorbonne Paris Nord)

Diophantine approximation and diagonal flows in the space of lattices

Wednesday December 10

14:00-14:45 François Thilmany (KU Leuven)

Finding ping-pong partners for finite subgroups of linear groups

15:00-15:45 Milan Donvil (École normale supérieure)

 The quantum groups behind W*-superrigidity

16:15-17:00 Pegah Pournajafi (Collège de France)

Quantum automorphism groups of 0-hyperbolic graphs

Wednesday November 12

14:00-14:45 Sasha Bontemps (École normale supérieure de Lyon)

Subgroup mixing in Baumslag-Solitar groups

15:00-15:45 Adriana Fernandez Quero (KU Leuven)

W*-superrigidity for property (T) groups with infinite center

16:15-17:00 Adrien Abgrall (Université Paris-Saclay)

Geometry of Outer space for right-angled Artin groups

Wednesday October 15

14:00-14:45 Hanna Oppelmayer (Université Grenoble Alpes & Sorbonne Université)

Invariant random von Neumann subalgebras

15:00-15:45 Corentin Le Bars (École normale supérieure)

Ergodic cocycles in hyperbolic and Hadamard spaces

16:15-17:00 Matthieu Joseph (Université Paris Cité)

Factors of the Bernoulli shifts for the infinite permutation group