Séminaire de Mathématique

# On the deformation theory of discontinuous groups acting on solvable homogeneous spaces

## by Ali Baklouti (Faculty of Sciences of Sfax & IHES)

Europe/Paris
Amphithéâtre Léon Motchane (IHES)

### Amphithéâtre Léon Motchane

#### IHES

Le Bois Marie 35, route de Chartres 91440 Bures-sur-Yvette
Description

Let $G$ be a Lie group, $H$ a closed subgroup of $G$ and $\Gamma$ a discontinuous group  for the homogeneous space $\mathscr{X}=G/H$, which means that $\Gamma$ is a discrete subgroup of $G$ acting properly discontinuously and fixed point freely on $\mathscr{X}$. The subject of the talk is to to deal with some questions related to the geometry of the  parameter and the deformation spaces of the action of $\Gamma$ on $\mathscr{X}$, when the group $G$ is solvable. The local rigidity conjecture in the nilpotent case and  the analogue of the Selberg-Weil-Kobayashi rigidity Theorem in such non-Riemannian setting is also discussed.

Organized by

Fanny Kassel

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