Chaire d'Excellence (2008-2012)

This page is a diary advertising events organised thanks to the Chaire d'Excellence "Geometry and Topology via Gauge Theory" (GETOGA) awarded by the Agence Nationale de la Recherche (ANR).

Nantes : Geometry of Kaehler Manifolds and Symplectic Geometry

A conference will be held at Nantes University from may 21st to 25th 2012 to celebrate Bogolomov's 65th birthday. See the web site for more informations.

Postdoctoral fellowships

Two more fellowships in mathematics have been created thanks to the Chaire d'Excellence GETOGA (1 year teaching free position). Congratulations to
• Reza Rezazadega (arriving in sept 2011)
• Roberto Mossa (arriving in jan 2012)
who is joining Jean Leray Laboratoire.

Nantes: Trimester on Contact and Symplectic Topology

A special trimester on Contact and Symplectic Topology will be held at Nantes University during the summer 2011. The focus of the trimester will be on
• Interactions between contact topology, symplectic geometry and low-dimensional topology,
• Applications of gauge theory and Heegaard Floer homology to contact topology
• Contact homology and Symplectic Field Theory
• Contact topology in higher dimension
• Floer homologies

CIRM: Conference on Extremal Metrics : Evolution and Stability

A conference on extremal metrics will be held at the CIRM in Luminy, from the 7th to 12th of February 2011.

The conference will present the new developments in the study of canonical/special metrics that can be considered as uniformisers of complex geometry (like constant scalar curvature Kaehler metrics, extremal Kaehler metrics, Kaehler-Einstein metrics, Kaehler-Ricci solitons, Sasaki-Einstein metrics, Bergman metrics, balanced metrics ...). It will also reflect the diversity of analytic methods to construct such metrics (flows, continuity methods, gluing techniques, ...) and the diversity of varieties where they live (compact and non compact Kaehler manifolds, Sasaki manifods, toric manifolds, spherical manifolds, orbifolds,...). Finally, a part of the conference will be concerned with the relationship between the existence of canonical metrics and algebraic conditions coming from Geometric Invariant Theory.

Invited Professors at Laboratoire Jean Leray

• Claire Voisin (IHES CNRS, 27/11/09)
• Geometry seminar: Algèbres de cohomologie des variétés kählériennes
• Julien Keller (Université de Provence, 10/11/09-11/12/09)
• Three Lectures: Autour du théorème de Calabi-Yau - Cours 1 - Cours 2
• Misha Verbitsky (02/11/09-13/11/09)
• Three lectures: on Sasakian manifolds and locally conformally Kaehler geometry
1. Sasakian and CR-geometry
2. Structure theorem Vaisman manifolds
3. Embedding theorem for Sasakian manifolds
Abstract: Sasakian manifolds are Riemannian manifolds equipped with an $\R$-equivariant Kaehler structure on their Riemannian cone. This allows one to characterize the Sasakian manifolds in terms of Kaehler structure on the corresponding cones. Three lectures are planned: 1. A characterization of Sasakian manifolds in terms of CR-geometry. 2. Locally conformally Kaehler geometry, Vaisman manifolds and the structure theorem, providing an equivalence of Vaisman geometry and Sasakian geometry. 3. A version of Kodaira theorem for Sasakian and Vaisman manifolds, giving a complex embedding of a Vaisman manifold into a Hopf manifold and a CR-embedding of a Sasakian manifold into a sphere. These results are obtained jointly with Liviu Ornea.
• Stefan Bauer (Bielefeld University, 05/09/09-09/09/09)
• Topology seminar: Proper maps between Frechet spaces
Abstract: The space of smooth sections of a bundle over a compact manifold is the paradigm of a nuclear Fréchet space, graded by Sobolev norms . Nuclear Fréchet spaces, as is well known, are similar to finite dimensional vector spaces. For example, compact subsets are characterised by the Heine-Borel property: A subset of a nuclear Fréchet space is compact iff it is closed and bounded. Homotopy classes of proper maps between finite dimensional vector spaces are closely related to homotopy groups of spheres via one-point compactifications. The concept of one-point compactifications does not extend neatly to the infinite dimensional setting. Homotopy classes of proper maps, however, remain closely related to homotopy groups of spheres, as will be put in concrete terms.
• Geometry Seminar : Refined Seiberg-Witten invariants
Abstract:This talk is a survey of applications of the stable homotopy approach to Seiberg-Witten theory.

Nantes: Special Trimester on Kaehler and related geometries

A special trimester on Kähler and related geometries will be held at Nantes University from september to december 2009. The topics of interest are
 Calabi programme, Extremal, Kähler-Einstein metrics Relation with stability Special Holonomy Sasakian geometry etc..

Postdoctoral fellowships

Two fellowships in mathematics have been created thanks to the Chaire d'Excellence GETOGA (2 years teaching free positions). Congratulations to
• Andrew Clarke (arriving in sept 2009), and
• Sheila Sandon (arriving in jan 2010)
who are joining Jean Leray Laboratoire. Another one year postdoctoral position is awarded by the CNRS together with the Chaire d'Excellence. Congratulation to
• Ethan Cotterill
who is joining the Laboratoire Jean Leray from oct 2009.